These sellers are not forum members. So I can't check their trust list. There are various groups on WhatsApp, Telegram to buy and sell them and I bought some services like ChatGPT-4 & Netflix subscription they really deliver. My question is whether I can have any problem using them?
I don't think there's a simple one-shot answer for this... If those groups got these subscriptions/services in a legal way, you'll probably won't have any problems with them. If they breached the terms of the subscription or service provider (or if they're plain hacking these accounts), odds are that you'll run into problems using them sooner or later...