You've always been "allowed" to move your photos from Apple Photos to Google Photos. The difference here is that Apple is doing it for you.
Curious, what happens if Apple locks your account (not in their ecosystem but M1 got me apple-curious ;)? Can you still export you're data, photos?
Additionaly, I plan to amend that with a self-hosted solution. I know, this reeks of tin foil, sure. However, whenever I read a horror story of someone getting locked out of their accounts and loosing access to their data a chill runs down my spine. Everytime I see captach start popping up too often I wonder if I'm suddenly, for some reason getting close to getting banned. This is the same reason why I have a GSuite account under my domain and never use login with Blabla solutions.