They scam people!
Even ex-employees admit that this is a scam business (reviews found on Glassdoor):
"they scam people... Since I stopped working for them I got so many messages of people that are super angry with me! the reservation got canceled and they never received any money... Also; they ask people to put positive reviews so never believe the 5/5 comments; these are comments from themself ;) (...) Stop teaching people to lie and cheat. Make a system that motivates workers and don't have to double cross people."
"The company only use free tools and tell you "doesn't matter about legal rules"."
"(...) they have to see a little bit of a cheater inside of you, then you will be inside" (concerning their interview process for new employees)
"The whole business model is kind of dubios (...)"
Besides my own bad experience with them and all the other negative reviews I've seen, this really confirms that this "business" is built solely around scamming students out of their money...