AmaZix are good. At least got not scammed with them. Almost all campaigns are paid on time.
Clear rules, and objective evaluation.
I think you are not aware of dealjoy project and 2, 3 more projects who scammed bounties even Amazix was running them.. the fact is amazix is also not trustworthy when it comes on bounty programs.
you should always do your own diligence and join a bounty on your own risk. and do not blame a bounty manager.