TVTropes is not a fucking "gotcha" "sin" listing and never fucking has been!!
TVTropes is a community website for talking about the building blocks of stories - motifs, recurring patterns, "stock" stories and arcs that we can retell again and again in different forms and interwoven with other "stock" stories and arcs and humanity will never tire of them as long as they're told well, that kind of thing.
TVTropes tells you, time and time again, that tropes are not inherently bad, nor are they inherently good; that "trope" is not a synonym for "cliche", they're just Recurring Ideas That Build Stories; that a story can be loaded with a million tropes and this is not inherently bad, and that inversely, a story can have nearly no trope that it doesn't subvert and that doesn't make it inherently good. That a story without tropes is like a meal without ingredients - it doesn't exist.
TVTropes is a GOOD media analysis wiki. Not always the deepest one, not always the most serious one, it doesn't usually delve into super subjective things like you'd get in a college class obviously, but it can, if approached properly, be a really fun way to improve your understanding of the mechanics of storytelling, prompt you to compare and contrast the way the same stock concept is used in different pieces of media (sometimes very, VERY different pieces of media, which imo is a lot of fun), all kinds of good stuff! It's not the be-all and end-all of media analysis, obviously, but for the specific, mechanical, "what makes this story tick?" approach it takes, it's a good resource - and especially valuable for a lot of neurodivergent people who might otherwise fall into "what the fuck are 'parallels' the curtains are just fucking blue fuck English class I hate this," especially if they're in one of the crappy high school classes that only wants to teach you WHAT the answers on a standardized test are and don't give a shit about HOW you remember those answers - ...speaking from experience...
The point is, TVTropes is NOT CinemaSins. Not even close. Not even remotely. The only thing they really have in common is lists.
As for CinemaSins, on the other hand - to be honest, I don't think CinemaSins itself is even entirely responsible for what we call the CinemaSins mindset, but considering the fact that they deliberately leave their own "sins" in to get people yelling their own "gotcha"s in the comments I don't feel particularly bad about conflating the two.
CinemaSins is, allegedly, a fun, quippy outlet that you watch to step back from a piece of media you enjoy and lightheartedly roast it, because stories have contrivances and characters make decisions that may seem really stupid to the audience especially once removed from The Moment and yeah, most movies have genuine goofs that are fun to giggle at. You list all of those, you have a laugh, it's fun, right?
Unfortunately a lot of people have decided, in the wake of its popularity, that this is what "critique" means - you take a piece of media and you go over it with a fine-toothed comb, engaging with as much hostility as possible, to get the most comprehensive list of "flaws" you can. The more flaws you find, the smarter you are! Literary analysis isn't about finding themes and pulling deeper meaning (that may or may not have ever been intended) from a work; it's about going over the work with your red pen; this is a competition and you're trying to beat the creator at their own game!
Again, I don't think CinemaSins is entirely responsible for this; it also has a lot to do with how things get passed around on social media, how people tend to boost easily-digestible things with a lot of emotional impact (whether because they love it or because they're angry about it, traffic is traffic), Nuance Doesn't Earn Clicks, and so forth, but they do play into it a lot so I really don't feel bad about "blaming" them. Even down to the name - these little things we're counting and giggling over aren't goofs, they aren't contrivances, they aren't little oddities that become funny out of context, they're sins (for which the creator must repent).
TVTropes has...absolutely nothing to do with this. At all. A trope listing is not a "gotcha"; it's a generally value-neutral statement that this story contains an element that has existed in other stories before and probably will exist in other stories again - and if you think "well you're accusing it of being unoriginal and bad for THAT, then", it shows a very limited understanding of how broad human literary tradition is.
Humans love stories. Our oldest known stock stories, our oldest known motifs, our oldest known tropes, date back to when we were writing on clay tablets. You cannot write a story without ANY elements that have ever been used before and have it remain believable or even comprehensible.
In other words, if you think "this story contains this trope" is necessarily an accusation of unoriginality (derogatory), you're already in something like that CinemaSins mindset, looking for something to be angry about, looking for a statement to read as an attack. A flaw. A sin.
Are there people who approach TVTropes from a CinemaSins mindset? Absolutely, and it's annoying as hell. "Oh, I don't want to read anything too tropey," or this drive to be "brutally subversive" that's less about the subversion and more about the brutality, sneering at anyone who dared to like stories featuring the targeted trope written straight, are a major annoyance in both fan AND creator spaces.
But does that mean the whole website is part of the problem? No.