Gamivo use the age old tactic of multiple re-selections of their useless subscription option.
To unsubscribe they have a neutral unsub button and during the process highlight options to cancel the cancellation in an attempt to get you to click the wrong section.
There are a few videos on youtube regarding this if you look about. Additionally, you will notice that they reply and use deflection as a response, or "offer to help" (you cannot get a refund, but as you very likely want nothing more to do with them, they get to mark the review as "attempted to help")
Judging from the massive amount of 1 stars here and 5 stars on trust pilot you can reach the conclusion that they pay for good reviews. Unfortunatly for them, a 2 word google search of "gamivo" and "scam" returns enough of these subscribe tricks to better inform people.