Twitter is engaging in a malign influence campaign describing this common phenomenon as a sign that Mastodon isn't a success.
Federated social media is far superior.
On Twitter the number of mute/blocks required to manage bots, trolls, sock puppets, bigots & fascists per day was a huge waste of time. You spent more time on that activity than actually reading or writing tweets.
Curating followers who were coat tailing or functioned to launch mobbings or brigading was tedious too.