Unfortunately not all bounty campaign managers care about quality and they usually accept participants who apply first in the campaign in order to fill it up.
That's why I think the SMAS effort fell apart--not because Yahoo62278, Lutpin, and whoever else was involved didn't care about spam, but that they had to fill the slots one way or another at the behest of whoever was paying for them to do so. On the other hand, now that there aren't as many signature campaigns around (paying in bitcoin), managers should be able to pick the cream of the crop. There are now and always were way more applicants than there are slots, and presently that should mean that a new campaign run by someone like Yahoo62278 could be easily filled with quality posters.
I think it's the shitcoin/token-paying campaigns and their managers that are the problem, because it's pretty clear that most of them couldn't care less about post quality. I just wrote this less than a day ago:
I'm pretty sure that if Jr. Members with 1 merit continue to be allowed to join signature campaigns, nothing's going to really improve.
For a while, there were some campaigns that had merit requirements to join, but that faded out. There used to be SMAS, but that also fizzled.
The solution has to come from Theymos in the form of restrictions on campaign managers and who they can allow to participate (or a similar solution). And I've said it a million times, there isn't much any of us can do but report shitposts when we see them.
Some campaigns just straight up don't care; the managers don't look at the posts before sending payments and accept every participant.
That happens almost exclusively in campaigns that don't pay in bitcoin these days as far as I know, although I have seen a couple new bitcoin-paying campaigns recently and don't know who the managers are.