I have a few years old account. One day they just blocked be out and rudely demanded a phone number.
At the time I had TOTP based 2FA since forever.
Fine, I got myself a burner number (not sharing a real number with creeps and bullies), account tot unblocked. I kept using it.
A week later I deleted a phone number form my account (marked as optional after all), and the account got immediately, immediately blocked, after I saved the changes.
