Yo mate, I feel you 100% - those wagering-free spins are gold but yeah, so many traps out there. Lately I've been digging around and honestly, some of the better updated lists with legit current offers (including no-wager ones on decent slots) are over at
https://betguiden.se/ . They keep it pretty straight with recs on Swedish casinos, bonus breakdowns, and even which providers drop the good stuff without crazy requirements. Not saying it's perfect but saved me from a couple dodgy ones already. Check their campaigns section, helped me snag some actual usable spins last week without losing my mind on playthrough. What have you tried so far?