A friendly reminder that isps do NOT care about you or your digital rights. Always best to buy directly from the OEM rather than from the telecommunications (unless you can't afford it). Do proper research before buying a phone!
I think it's 72h after linking your phone to your Xiaomi account, don't need their pc app abd tools work fine.
It's still one of the brands that are most open for custom roms since you'll retain your warranty unless you manage to do physical damage to the phone in the process.