Do you know why 30% was chosen? It was the typical cut retail took. Physical stores selling goods take that much to cover their lease, logistics in moving those good to the store and employees.
Online stores do not share most of those costs. 30% is not needed.
This was about bluesky/Twitter type social media. Things with reshare and follows to specific users, where someone you follow arguing with someone you don't will expose you to the person you don't follow.