Ad moderation won't happen until there's a unified group which can moderate ads and can't gain from being more permissive. Basically, advertisers need to unionize against their own common interest to increase the quantity of ads.

This has kind of happened already in the form of sponsorships, where each ad is vetted and can be rejected on a case-by-case basis. Each presenter is acting alone in this case however, letting bad sponsors slip through. Bad sponsors are often slammed on in feedback though.

Perhapse if advertisers could remove their heads from their posteriors for a moment they might see that neutrally read ads with no music would drive far fewer people to block them, but this could only work if all ads on a platform were limited in this way, and such regulations could be reliable and specific enough to make blocking more hassle than it's worth.

I'm having difficulty imagining a blocker driven agreement though, as any level of leeway for ads would all but require compensation, and that's 99% of the way to corruption already.

However, this all could only work if for-profic companies could be convinced to not seek every possible profit at every point immediately, which is unlikely.