I stopped when I stopped being comfortable with them looking at my data. My sensibilities changed and software options had advanced to the point that the activation energy of switching to an E2EE solution had been surpassed. I use self-hosted nextcloud + wireguard + B2 encrypted backup. It's not perfect, it's more setup on each device (no longer a single auth away from the data), but it's well worth it to me.

There's a market here. Idk how big. Apple seems to think there's a market here too. If they offered larger sizes I might be tempted to go all in on Apple.