Well it seems like this article is talking about suspensions, not bans, and the language some of the suspended users used is confusing:

https://www.businessinsider.com/twitter-users-criticizing-mu...

But there was more notably a wave of people being permanently banned for changing their display name to Elon Musk, a previously accepted behavior on Twitter:

https://time.com/6229960/twitter-bans-accounts-elon-musk-imp...