Except many advertisers don't want to be associated with damaging things. So this has an impact on advertising revenue for social media companies and they would absolutely view this as a blow to their public image.
We need to break them up, and legislate against their practices for the future but this is something that can happen right away and hit them in their pockets
It's really not about revenge. It's about taking back power from corporations and giving it to the people. Right now, political power is with the highest bidder and these companies know it.
They are using the money from advertising to lobby and buy politicians, which is what stops us from having sensible regulations for social media. Taking away that revenue stream inhibits their ability to do this, so it's a win for the people