doing checks etc doesnt mean anything if you don't have a taxi licence. Now, the way the gov limits those etc is the stupid thing.there's nothing illegal about going to a seminar, that's why the cops don't arrest people there. As you'd need a new PayPal account each time I think I can guess why the cops haven't just kept calling uber drivers and ticketed them, for now. Maybe they'll have an operation/crackdown at some point in the future.
end result: you legally could get a 4 figure fine, but it's not likely at the moment.