Give all users, premium or not, unlimited blocking. Sometime someone is harassing you and there nothing you can do because you ran out of free blocking. That most of time results in the members deleting his account. I know they can report but until you guys review it one already had to go to a lot of harassment.
Gordon Es commented
If you report blank taps etc as harassment (like how you'd report an anonymous phone call) eventually Grindr will increase your blocks and then eventually make your blocks unlimited