Yes, I periodically go through and check these about once a month on boing boing for example. They get about 1 per day like this. These users never post, so their spam is the profile, but remember that new users do not show (are not allowed) clickable links on their profiles. And we actually suppress the about me text to other users for TL0 new users. So the impact is low.
Compare:
The only proposed fix is to pass new user “about me” through Akismet but we have not gotten around to it.