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You should try as much as possible to get those that are already listed for obvious reasons. I don't think people would compensate if their coin failed to get listed even if their promoters did so much work.
Watch out for bad BMs that are just trying to waste your time though.
Indeed. Working together with reputable Bounty managers is somewhat reliant and gives us some assurance that we got paid at the end of the campaign and do follow what the rules have been said. I participate in bounties before and I'd look at who does the management and is in charge of the payment as this really matters, not how much I get even if it was a small amount to be share as long as it was a decent project and not scam.