You can put the pumps in maintenance mode. I did it on accident once looking for the mute button. I held down one of the buttons for like 10 seconds and the pump went into maintenance mode. Just leave it like that lol.

Have you checked out Medela, we used one of those a couple years back and there was no app involved. No data collection, just plug it in and go.

I do this. I’m slowly transitioning from Gmail to my own domain. I use tutanota for my email host, which was relatively easy to setup and is not prohibitively expensive.