I downloaded the free app and when I opened it, I was immediately taken to a web form asking for my name, email address and credit card for verification purposes only. They said my card would not be charged. I thought this was the free app verification process, but it is a scam.
I had actually been subscribe to tudum.co and was then informed that, after 5 days, it would not be free. There were no explanations of exactly what the cost might be. When I tried to cancel, there was no way to do this online or via email, except through their contact form or via a contact phone number. I sent a cancel message via the form but the phone number said it wasn't available until weekdays. I received a member confirmation email but not cancellation confirmation.
As a result, I have cancelled my credit card and informed the credit card company about this and am checking my bank accounts. A charge of $1.00 had been made to my credit card via ent-hole.co, probably to make sure it was a valid card.
I hope this will be investigated and something done to prevent this kind of thing. These companies appear to be offshore.