Hello Sir,
This billings are done through Itunes / Store through VCC and then there are different loopholes / offers going on in different countries. off course Users may do this themselves if they have the required knowledge, but for rest of them not wishing for headache, We are here to serve, with Replacement Warranties.
They are 100% legit, Yes, because there is no Cracking or hacking involved, as a proof the user may change the email and password once he buy.
I am certainly not the owner of this companies sir , apology if you thought so