You may be able to advise a reputable manager like Hhampuz, Murat, CryptopreneurBrainboss, julerz12, irfan_pak10, Royse777, and some others managers to limit newbie and junior members from joining the bounty they manage. But your suggestions may be useless and ignored by some novice managers or other low ranking managers representing the project team. Maybe it would be nice if all managers implemented it and made those suggestions as local rules for themselves and the bounties they manage so that it becomes a good habit in the future.
It will be ignored by most other bounty managers that you have not named because they do not care for the forum they only care about advertising their scam projects. I think we should stop all bounties that pay in tokens and only allow campaigns which are paying in Bitcoin because the Bitcoin paying ones are hiring better quality members because it is worth something. The tokens are worth nothing and only newbies are interested in posting for something that is worth nothing but might be worth something in the future. I think if theymos changed the rules to only Bitcoin paying signature campaigns and bounties we would see less spam everywhere and he could probably save money on hiring staff because there would be no need for them when the spam is removed by that change.