Crypto casino tournament systems: are they actually fair or predetermined?

so i’ve been dipping into these crypto casino tournaments lately, mostly out of curiosity since the prize pools look sweet and the entry is low friction with btc. but it’s got me side-eyeing the way winners get picked or leaderboards move around. i swear some names pop up and disappear in weird patterns, especially at off hours.

i get that poker at least is player vs player, and most sports bets are market settled, but for these slots or roulette-based events, is there any way to tell if they’re actually fair? some places talk about “provably fair” but who’s really checking the math except the house? has anyone here actually dug into the code or stats, or is it just vibes and luck after all?