What is an unofficial ChatGPT API supposed to be? One where you dont have to pay? I‘d hazard a guess that if that exists, it would just be a wrapper around someone elses API token, for which they are paying. Questions is whether they know about that usage…
Having weak security on your operating system certainly isnt helping when there is some sort of exploit in a browser running on that system. The perfect operating system may not prevent issues inside your browser, but it may limit the damage these do. I feel like you suggest using Linux reduces security - why do you say that?