Allocations for signatures are bigger than others, maybe that is why many chosee more signature. But for now there are a lot of scam bounties if we are not smart at choosing Bounty, so it's useless if we don't get paid in the end, I have experienced it too, so it spends no time, energy and mind. Therefore I am more careful in choosing Bounty for now.
Therefore I suggest that you take part in the Bounty in Bountrust, because so far they always pay for it and the projects are mostly always successful, you can choose legit Bounty in the Bountrust channel telegram here: https://t.me/bounTrust