Why Twitter super follows is not widely adopted? or is it?

Since quite some time I am wondering why there are so many successful creator economy business like substack, patreon and more but twitter super follows (Formerly paid subscription) is not widely accepted. I paid ~$5 to subscribe to elon musk but even musk is not actively posting for his super subscribers. Same case with many other personalities. Ideally this should have worked wonder, imo.