I actually agree, I own my computer / OS and I should be able to do what you’re saying (install and break things). But Microsoft is a trillion dollar multi national corporation and I am certainly going to give them grief about this because I owe them less than nothing, let alone any good will.
Sadly this is probably impossible at this point. Before their whole fiasco discontinuing the desktop app there was a procedure I did where I was able to download a super old version of the desktop app and use Chrome to get into the dev interface (or something like that) of the app, then use a script someone made to export everything. Maybe if you search around you can find some way to do this with the mobile app, but I am not optimistic.