Only something like 10% of users tweet regularly. I wouldn't be surprised if most twitter accounts are run by PR firms, bots and blue check marks. The other active ones are probably alts of power users who were self aware of their behavior and decided to be anonymous.

https://www.theverge.com/2020/2/22/21148516/twitter-suspends...

https://www.vox.com/2018/10/19/17990946/twitter-russian-trol...

https://www.npr.org/sections/coronavirus-live-updates/2020/0...