How do you know if it was in fact the guy who used the account to violate the TOS? While I don't intend on doing this myself, I'm HORRIFIED at the idea that Go

How do you know if it was in fact the guy who used the account to violate the TOS? While I don't intend on doing this myself, I'm HORRIFIED at the idea that Google would suddenly cut me off from all my data without reason.