One of the sad things about this story is that everyone has to read tea leaves to guess what reasoning might be going on at Google's end. Tech companies have normalized the practice of cutting people off with no explanation, or saying 'we investigated and found a violation' without articulating what the violation is. Naturally, they want to secure themselves against abuse and people trying to game their system, but refusing to provide any information does not achieve that.
It does infuriate legitimate users, enables other kind of abuse and scamming (eg immunize yourself against delisting with this one weird trick!', link farming etc), and act as a fig leaf for abusive behavior by platform operators. Effectively, we've allowed large teach companies to act as digital dictatorships with no accountability to their customers. Yes I consider users to be 'customers' even if they're uploading content or doing searches 'for free'. If you're monetizing their activity on your platform, they are your customers whether or not you call them that to avoid legal liability.