For me, the gems that I choose are:
1. Managed by famous BM
2. Bounty funds via escrow
3. The bounty allocation is reasonable, not too big and not too small.
Then just do a little research on the project to be followed.
Yes, I agree with you, but escrow can't be said to be an important benchmark in running a bounty,
there are lots of tokens that use escrow and it ends up being a scam, for example Nody,
this is why we have to pay attention to the project, both in terms of fundamentals too,
if it is an aspect it's good then join the bounty