If I'm running a business, I may wish to make a moral judgement and not do business with an energy company because I don't think they're climate-friendly, or avoid doing business with Facebook because of their stance/impact to privacy, or not/stop buying peaches from 9/11 truthers www.palisadeproduce.com. I think these are all completely reasonable and normal ways for me to run a business.
In the same vein, other people are welcome to a view on the above, who i do business with, and try and change my mind, and might withhold their business from me because of it. I think that is also completely fair and normal.
No one is forcing anyone to do anything. Everyone's just having an opinion and operating by it.
Personally, I don't think Cloudflare should stop providing service for these website. I think they have a leg to stand on with saying they're a neutral dumb pipe who will just follow the law. But I also don't think it's abhorrent for people to think different, and try and persuade Cloudflare to cut their relationship with kiwifarms