we start with my question, is it possible if we join bounty without us caught, if we pakek 2 account or more
It's not against the rule of this forum to create and use multiple identities, use proxies, tor or public networks.
Joining a (single) bounty program with more than one of your ids is not encouraged.
If you can manage the quality and quantity, Joining different campaign from different ids would not be a big deal.