One problem with Bitcoin at the moment seems to be the fact that many people seem to consider it to be a source of income rather than a form of payment or a store of wealth. Until Bitcoin can distance itself from faucets, penny gambling sites, and various other petty scams, then you will get low quality posters promoting such things. I'm not sure I can suggest a solution though.
I actually see people considering Bitcoin as a source of income as a net positive. The
way they earn it is misguided, but I'm afraid that's more or less a reflection of "services" that pay most for people with little to no expertise.
If we look at the majority of the spam nowadays, then it's without a doubt coming from the altcoin/ico side. It's insane how it has evolved into a massive spam problem.
The "get rich quick" mentality seems to be very strong on those boards, which limits the amount of meaningful conversation. I remember that it
used to be at least
somewhat about finding solutions to problems that Bitcoin has, at least until the creation of new alt coins reached comical levels. Now there's little to no interest in innovation, just people shilling their own favourite alts and ICOs over and over again. I think not even getting rid of signature campaigns could solve that, because people will try to pump (or at least defend) their own investments no matter what.