Entrusting our speech to multiple different corporate actors is always risky. Yet given how most of the internet is currently structured, our online expression largely depends on a set of private companies ranging from our direct Internet service providers and platforms, to upstream ISPs (sometimes...
The only thing Yubo could/should have done is forward it to the police though (which is what the users that initially reported this content should have done as well, independently). I’m not sure why that hasn’t happened. I hate to say it but this is still not the company’s responsibility, the most they can do directly is ban his account which wouldn’t accomplish anything in this case. I’d say go straight to local authorities rather than expecting services to handle it.