I understand that some people with signature campaigns do not provide anything to a discussion and they just write silly unintelligent idiotic things that doesn't improve the discussion at all.
There is a very effective solution for signature spammers, report them to their campaign managers or to mods with help of "Report to moderator" button. The first choice is certainly better, because each decent campaign manager will remove such a user, and maybe even add them to black list.
It's worth a try and good managers will care of course but the large majority of shitpost spam is still caused by altcoin signatures where the bounty is often managed in-house by the shitcoin devs or lazy bounty managers and normally, they don't care what their participants are posting as long as it brings attention to their shitcoin. (cryptotalk seems to be the only exception here as campaign with low requirements while paying in BTC.)
After all we can say the situation is quite comfortable right now compared to 2017 / 2018.