I'm in pretty deep on the email side to the point where leaving would take days or weeks of effort. I'm not above making that effort if I think it's necessary though. I do not yet think it's necessary.
I did just start using my second Proton product, Standard Notes, around two months ago. I'm not honestly sure if I'll renew it when it expires - we'll see how the year goes. I honestly have very little expectation that Proton is enshittifying or turning evil. I'll be very surprised if it becomes a recurring pattern for them.
It's owned by, but not made by - they acquired it at some point. I don't think they've really done much to it since acquisition but I assume they have things planned, because otherwise why buy it?