maybe not important to some, but I was super-unpleasantly surprised a couple months ago because proton deleted my dormant account. my recovery account received a couple of warning emails (didn't check that one in ages) and when I finally got around to it, gone.
so if you're thinking of using it for anything long-term, know that you have to log in once in a while or it's gone.
ALL YOUR SEARCHES are tied to your email, forever. all your queries safely stored, waiting for someone to hack them or them to abuse that data somehow.
now reread your question.