Because that depends on your motivations, which I don't know. If you want to prevent your content from being used to train an LLM, CF is not going to prevent that. If you want to protect your site from heavy traffic, CF will do that just like it always has. If you absolutely don't want to your content used to train an LLM, you're basically out of luck if your site is public. So no you shouldn't abandon CF because you get other benefits from it if you need them, but don't expect that you've done anything to prevent your content fro training any given LLM.