In principle they're comparable. In the real world, no high school kids are going to harm themselves over an argument about Mint versus Ubuntu on a 100,000 subscriber ATmosphere site. It's like comparing the Dominican cigar shop selling hand rolled cigars with Philip Morris. Unedifying.
Teenagers have been bullying each other for literal millennia. Kids got bullied on IRC and chatrooms; they get bullied today on Roblox, on SMS group chats. None of these have engagement algorithms.
Again, the corporations sure aren't helping, but we need to confront the fact that a large chunk of this is human nature. I'd like a better Internet landscape but switching from Facebook to Mastodon or whatever, while a good step, isn't going to cure all ills. A lot of people in these threads act like every Internet toxicity symptom ever arose because of evil corporations.
Facebook targetted teens who posted self deprecating comments for beauty and weight loss products ads.
It was no random that facebook became a hotbed for conspiracy theories, misinformation and lies. That part is result of their own conscious choices. They made it that way, because they wanted it to be that way.
Facebook moderation favored pro-genocide side of the politics in maynmar. Its own decisions made it instrumental to the events. The issues were solvable and visible, Facebook was the primary gatekeeper there due to contracts it had, but Facebook refused to do anything even after it was crear what went on.