A useful bonus starts with the fine print: compare 25x-60x wagering, check...

https://blogfreely.net/teresa-long85/why-do-casinos-set-max-bet-limits-during-bonus-play

A useful bonus starts with the fine print: compare 25x-60x wagering, check whether non-progressive slots are the only eligible games, and note deadlines that can be as short as a few days. The headline offer may not be worth it.