I used to buy residential IPs from a competitor of Oxylabs in a previous life. Nothing illegal, just scraping data from websites using cloudflare. (Cloudflare has some anti-scraping-scraping protection, even if you do 1 request per 15 second)

I asked this question, the answer from this other company was "we would close your account". But they were unable to explain clearly to me how and if they monitored this.

In fine, I think this is your responsibility, you basically voluntarily installed some malware.

It might be against your provider's terms of service, but it's hardly illegal.

If someone else is doing illegal things on your IP address then you could blame the (users of the) service to avoid liability. Still you could find yourself targeted by a lawsuit. I wonder if Oxylabs' terms protect you in this case.

Most people wouldn't even know to ask.