Twitter isn’t a monopoly? What’s the other popular social network where political discussion happens?
You coming up with David Duke as an example of a controversial ban is an excellent example of my argument. Was this considered controversial? Who supported Duke remaining on Twitter?
> Can you name a single high profile twitter ban that was due to promotion of white supremacy, sexism, or similar?
Since you only asked for one, I'll give you probably the most clear cut example that can be asked for:
David Duke, well known former KKK grand wizard.
https://www.bbc.com/news/technology-53608106
There you go, now you have one. If you want more, I'm sure you're more than capable of doing the research yourself.