I can confirm that I received free bet in my account but I don't know if there are any special rules for withdrawals in case I place a bet and win, or can I bet on any odds?
I am going to test how everything is working in next few days, placing a bet with possible withdrawal, and report in this topic after that.
Some users have confirmed here that free credits can be played in pragmatic slots you have to make 30x wagered to release the bonus
After that you have to make 1.5x wagered to be able to withdraw the balance so actually you have to complete 2 times the wager requirement
You have to be a lucky user to get this free money it sounds difficult but someone has done it already.