Your error is declaring these platforms are "just a place."
There is a ton of evidence YouTube, Facebook, Twitter, etc. deliberately push inflammatory / extremist material to people to increase engagement.
My 8 year old daughter exclusively watches Let's Play and "how to draw" / DIY crafting videos on YouTube, and still gets recommended content on why vaccinations are dangerous and junk health pseudoscience, flat earth and New World Order conspiracy theories, and a ton of comparatively vanilla highly biased political "commentary."
Their algorithm tells them if they can get her interest on these videos (instead of others) she will spend more time on their site. They do not care why she is spending more time on their site, or if there is any societal harm from the content she is consuming - it's a "free country, after all."
If every time you went to your coffee shop, they introduced you to another customer peddling snake oil or handed you a newspaper full of extreme left or right wing talking points, you wouldn't say "it's just a coffee shop."