The Samsung Galaxy XCover6 Pro has a replaceble battery while being IP68 dust/water resistant, which means it can be submerged in water up to 1.5m/5ft for 35 min. It’s definitely possible, but they just don’t want to make such phones apparently.
I really hope Fish was just a typo there
Your best bet is probably contacting them. This can be done on this support page. Select ‘Inquiries Related to Your Privacy Rights’ and then under ‘What do you need assistsce with?’, go with ‘Request account deletion/deactivation’. Hope this helps!
No? I have an iPhone in the EU and have several sideloaded apps. All still work and have all the data even after not using them for a while.