The intent is to not reveal that the account had been linked to (for example) financing of terrorist organizations, but in reality I think it causes more problems than it solves. A real criminal who has their account shut down is probably going to be pretty aware of what the reason is. On the other hand, many times something like this can happen due to a mistake by a government agency, an account takeover, or some other situation where the owner of the account has no idea what went wrong or how to fix it, and finds themselves blackballed by multiple financial institutions with no recourse.
I’m not a fan of PayPal by any shot, but I would wager a nontrivial number of the customer support nightmare stories we’ve all read actually come down to this, and their hands are completely tied.