Hello, I'm working in small hosting company that primarily hosts marketing websites. We are using worker to handle some data so the question is: what if some of website will get an abuse? Would my worker or cloudflare account get a ban?

Can you expand on what kind of abuse you're talking about? If there was some malicious file, you'd be notified and told to cleanup. If you ignored, action may be taken. If it just got a ton of requests, nothing would happen.

Any kind of abuse that can be reported on website. There are no files there, worker only redirect and modify some requests. We don't know what are stored on every website but want to ensure that our features don't get banned