One aspect of this story that was under-emphasized is Twitter's hostility to victims of impersonation.
I was one in 2015. Here's what happened...
You must do this individually for EACH account. There were over a hundred.
I spent hours, and got through about 30.
In the meantime, new impersonator accounts were being created.
2) I started making my own bots.
It took less than an hour.
This shouldn't be easy. All I needed was a rotating set of IPs and a headless browser.
Twitter can do more.