Hillary Clinton went on TV and said we should get rid of Section 230 in order to moderate content. So is it really that surprising that SV made a right turn?
[1] https://www.forbes.com/sites/abrambrown/2020/05/28/what-is-s...
https://www.cfr.org/in-brief/trump-and-section-230-what-know
There's no way the situation can stay like that forever. There will be regulation like there's regulation of TV, radio, press, etc.
Without regulation you don't get a libertarian utopia - you just get oligarchy.
Most libertarians aren't rational egoists, they are just naive losers oligarchs take advantage of to get more power.