I've been thinking of a solution to this for a while now but the problem persists. I'd love to not have to indefinitely increase my Google drive storage, and in fact I have a home server with terabytes of free space on it where my and my wife's photos get automatically backed up. The problem though is that they're so much more usable and accessible in Google Photos. We have shared albums with our friends and family of our kid, of vacations and events. If I don't remember when that funny picture of a duck was taken I can search "duck" or see a heat map of my photo library.
The same problem is true with Proton Drive. I mean, I did just set up photo backup because why not, I have the space. But once they're there what good are they if I can't find them, organize them, share them?