My school has provided us some emails with a custom domain (not @gmail.com but @myschool.smth) and we as students are only able to login via gmail, however i obviously do not want that. What can i do to prevent that? I tried logging into the email via Thunderbird but i get blocked because my administrator doesn’t allow that.

Whenever i talk to people about privacy, specifically my friends when i tell them why i switched to Signal and stopped using WhatsApp, i’m always met with people saying that i’m just making no sense and “why would you care so much if you have nothing to hide? I don’t care that meta sees that stuff” and some people are just so stubborn to understand that they might even settle on the “what would a billion dollar company want from me specifically?”. It makes me mad how people refuse to even consider alternatives and open their mind a bit. What do you think?