Granted, it is a stretch and not near the features of Claude (no code etc), but at least Proton's Lumo [0] is very privacy oriented.
I have to admit, I've used it a bit over the last days and still reactivated my Claude pro subscription today so... Let's say it's ok for casual stuff? Also useful for casual coding questions. So if you care about it, it's an option.
If you aren't using it for coding or advanced uses like video, etc, you can try running models locally on your machine using Ollama and others like it.
Self plug here - If you aren't technical and still want to run models locally, you can try our App [1]
Since I don't use LLMs to directly code for me, I'm going to (mis?)place my trust in Kagi assistant entirely for the time being. It claims not to associate prompts with individual accounts. Small friction of keeping a browser tab open is worth it for me for now.
From the frypan into the fire. I think the reality, proven by history and even just this short five years, is no company will hold onto their ethics in this space. This should surprise no one since the first step of the enterprise is hoovering up the worlds data without permission.