It doesn’t matter what your personal opinion is. It doesn’t matter if you think a big ole watermark looks bad. Or if you think the artist should be happy their work is being spread by reposts. Or if you think that it’s fan art so they don’t have a right to claim it. Or if everyone else is reposting too.
That is an opinion.
What is legally binding is COPYRIGHT. You literally have to wait something like 90 years after I’m dead before my work becomes ‘free to use’.
Copyright protects a creator. Giving them the rights to control how their art is used. Copyright means Zagtoon could tell us all to take down our gif sets/stills from their show if they felt compelled.
Trademark means they could make us take down our fan art if they choose. (Specifically if we’re making money off it)
But copyright also means Thomas Astruc himself could not take our work from the net and sell them in an art book without at least a big complex contract signing between all parties.
So if the owners of the Ladybug IP are not allowed to use our work without permission despite owning trademark, some asshole youtuber who ‘only owns their voice’ can fuck right off.