I switched from Google photos to immich so I could keep my photos more private (self hosted on my own NAS). I still keep Google photos installed on my phone so I can edit photos (the editor is really nice to use). Every time I open it, it bugs me to resume backing up to Google. This week I found that it had started backing up to Google again although I don't remember accepting so I had to go and clear out all the uploaded photos again.
I hate this. Even when I decline to back up it usually then nags me with a second screen asking if I want to do a one time backup. Like, no. I don't want to send any of my photos to Google.