Of course. I wish that Immich had existed when I started using Google Photos, but it didn't. And I'd just had my first child so I really wanted to ensure I didn't lose any memories.
These days I run the two in parallel.
Plus friends and family inadvertently give Google/Facebook (etc) your personal info via tagged photos, contacts, DMs without your consent and they gather/link/sell this collateral info to the highest bidder without anyone being the wiser.
Sure, but that's not the same thing. How they use the data is the important part. The google photos are not to be used for security for example. Different ToS.
We should try and not have a defeatist attitude and fight back as much as we can
There's no reason to believe the mess couldn't get any deeper, so backing out now doesn't have to be useless.