I've muted around 3000 accounts and 200 words, which is a lot when you consider I don't even post on the platform I just read it and still my feed will have political hot takes slip through the cracks.
Twitter has the data, they could put a huge "Politics On/Off" switch in preferences but they choose not to because they know that forcing me to look at politics is both more profitable, ideologically I think they think controlling what political message I see is important too and they're fine with the tradeoff being mental health damage.
Speaking personally, there are several people I follow who never actually generated real content. Instead they just liked asinine, toxic political takes, which then filled my feed.
https://blog.twitter.com/en_us/topics/company/2020/2020-elec...
For example, I unfollowed someone who started to post photos of their every meal. And I unfollowed my own mother because she tends to repost every scare "chain letter" that comes across her :)