Used both Cloudbet and Fortunejack for a long time, and I must say that both are legitimate platforms, albeit the former having some issues regarding scams and customer funds. As for being provably fair, both claims to be one, and I'm sure there are ways to do that for yourself, too.
and a question about live dealer, it seems that on every site i try to get a seat at a table, its nearly impossible, the low minimum bet are ALWAYS full, so i end up playing first person blackjack, which makes me a bit anxious since after all im playing against a machine, which who knows if rigged or not ?
Not entirely sure about live dealer games. They are always full oftentimes so it might be that you have played during peak hours which explains why you can't get a seat.