the trick is people value simplicity. platform coops promise to be that one place for that type of thing that the dominant corporation provides, but without the evil. if they don't achieve ubiquity, the value to us is severely limited.
if I want to download #ccmusic, I look for the musician on Bandcamp. if I want to give a podcaster or writer ongoing support, I hope they use Patreon. I don't want to manage multiple accounts either. my dream is decentralized solutions for both.