promotional bonus integrity and whether casinos honor these fairly

Trying to figure out if anyone here’s actually received full payouts from these promo bonuses, or if the casinos always find a way to backtrack after you’ve met all the turnover requirements. I get wary when the terms are so long I need a spreadsheet just to keep up, especially when you’re winning off a low edge game like blackjack or flat betting on roulette. Been stung by a few places with creative excuses on the “spirit of the bonus” or “irregular play” after the fact.

Is it really just luck of the draw which ones honor it, or is there a reliable way to tell up front which casinos play fair with promos?