Everyone always wants a technical solution to grow communities. act as though some sort of filter rule or item in the settings menu that will cause more users to post and communities to grow, but always will refuse the most basic thing in communities. Community culture you can always say forums are the public square of the internet. If you don’t have anything to see or do in said square it might as well be a empty abandon parking lot.
Google is the biggest of browser and http/s internet based protocol, so much bigger that everyone plays by googles rules. if they set out manifestv3 the other browsers that are not compatible will not work, and as a result people will abandon them.