Free bets can look straightforward until you check what happens to the stake....

https://wiki-dale.win/index.php/Where_can_I_find_a_list_of_online_betting_sites_in_Ireland%3F

Free bets can look straightforward until you check what happens to the stake. This guide for Irish customers explains the key terms, how to compare offers and why a €10 free bet at 4/1 returns €40 in winnings when the stake isn’t returned