As a tutor, you have to click on "accept classes", otherwise you can't communicate with the prospective students to find out their level, needs and availability. So, in principle you have to commit to something you know nothing about. The default message to be sent to the students says the first class is free, i.e. the tutor will not be paid. Of course, there's no way I was going to accept that, so I edited the message every time. However, after negotiating with one prospective student only to find out our respective schedules made it impossible to do any classes, he informed me that Superprof were charging him 19€ for the first class (which never happened, of course) and could I reimburse him? Whichever way you look at it, this is a total piss-take. Avoid like the plague.