i know it's easier to see a headline and get angry about it online than it is to look into the source, but if we all did a little digging, it's evident that this is misinformation. the source is a blog post from a tech startup that is advertising their data analysis services to other streaming companies. the spike in subscribers (which lasted for two days) occurred over a four day period, of which, only the 26th and 27th of may had above average signups, the previous two days were under 50k signups per day.
what their data (purposely) fails to show is the sharp decline in signups between the 27th of may and the first of june, the day that these features rolled out, because their chart cuts off before the password sharing crackdown even went into effect. their data also does not count the number of cancelled subscriptions, and does not distinguish between free trial sign ups and paid subscription sign ups.
they are trying to make netflix look good to advertise their services. this is marketing, not actual data analysis.