Yupp. My account at a particular website was terminated. They pointed to their TOS, where "anonymous" address are not allowed. Wasn't even given the chance to keep the account and change the email to an "acceptable" one.
Just a guess - private trackers often do this. Back in the day I got banned at couple of places because of a riseup email.
Not gonna reveal as it's got to do with my private life :p
why do they say it's anonymous? I use proton, it's encrypted but not anonymous. (unless you used the hash option someone else posted (I didn't know that was a feature)