The big mistake that the CEOs of both Reddit & Twitter have made is failing to realize that their sites are supported by lots of unpaid labor (creators, moderators, etc) and it’s not enough to focus on experience of users who’re mainly readers of these sites.

The 1-9-90 ratio is real.
https://www.theverge.com/2023/6/10/23756476/reddit-protest-api-changes-apollo-third-party-apps

Reddit’s users and moderators are revolting against its CEO

Reddit’s unpopular API changes, the shuttering of the Apollo app, and a disastrous AMA with CEO Steve Huffman has prompted a backlash as thousands of communities go dark in protest.

The Verge
@carnage4life StackOverflow is going through a similar situation right now too. In that case it's not about charging for API access, but one of the major issues is cutting off archiving of data (the bigger one is their new AI policy).