Twitter is testing this feature to allow users to chare for following them.
https://www.theverge.com/2021/2/25/22301375/twitter-super-follows-communities-paid-followersThe payment feature, called Super Follows, will allow Twitter users to charge followers and give them access to extra content. That could be bonus tweets, access to a community group, subscription to a newsletter, or a badge indicating your support. In a mockup screenshot, Twitter showed an example where a user charges $4.99 per month to receive a series of perks. Twitter sees it as a way to let creators and publishers get paid directly by their fans.