...that rely on advertising.
It's comparatively easy to moderate communities if you're willing to permanently ban bad actors. Trouble is, that shrinks your audience, which reduces advertising revenue. Reporting accounts on Twitter, Facebook, Instagram, et al, is a multi-step process of making excuses for why your reported post won't actually negatively impact the malicious account.
Youtube demonetizing creators with too aggressive stances is an example of that, but we also had Reddit banning whole subreddits when their sheer existence had a nefarious effect on the platform's ability to negotiate ads.
When the choice comes down to more active users but lower prices offered, vs less users and better ad prices, platform tend to go for the latter I think (4/5/8 chan being exceptions)
This is a crazy hard problem that is plaguing the majority of our mainstream social platforms. Looking at Twitter/Facebook/Reddit etc. moderation+harassment is mostly solved by brute force community management, and is extremely costly, with a human component that is hard to ignore (Facebook moderators are plain miserable and prone to stay mentally hurt even after leaving the job)
This is where Nintendo decided to bail out of the problem altogether by blocking personal interaction by default on their online platforms. If they don't have the resources to do it properly, limiting the attack surface feels like a sensible strategy.