This happened to me today, and its not the first I've heard of. I type in one of my YouTube accounts to check on it, get the standard This account has been terminated due to repeated or severe violations of our Community Guidelines. Then I log into the account to check the Gmail, but I get a message asking me re reverify my phone number because unusual activity has been detected. Upon doing so, I check again, and the YouTube account is back up. Interesting. This happen to anyone else?