I thought CopperheadOS was just the former name for GrapheneOS? At least that’s how I understood the statement on their page.

That is the first time i’ve heard that. Not sure about it, but sounds like it could be true. Interesting nonetheless.

I always recommend Proton Pass. A) because they have a forever free version and B) because hopefully they start looking into the whole suite in general and even if they don’t subscribe, they are more aware afterwards (hopefully).