Even if I ever get an Apple device, I won't be using anything that's locked down. The only reason I trust Google with my files or Mozilla with my history and bookmarks is because they're not locked down to their own ecosystems.
If I get an iPhone, I know all my Google stuff will be there.
If I change my operating system, I'll still have all my stuff.
Despite owning a Samsung phone, I use literally none of their services. I don't even have a Samsung account and changed everything to stock. I should be in control, not corpos.
Hope you can get all your stuff back. In any case contact Apple support or something, threaten legal action if needed (that worked for me when dealing with Nintendo).
Legal action seems to be the way to go. I went from Apple to Samsung and I did notice their attempt of a password manager, I ain't getting fooled twice
You can switch password managers in the settings to use Google or whatever else you want. It's pretty nifty.