Let's put an emphasis on the fact that this cannot be a technical limitation, as everyone else in the world manages to build websites that work on most devices, including android.

The appleid is a security nightmare anyway. I used to use an account, associated to an email I own, with a password I know, and still I can not log in, because it keeps asking the insecure "personal questions" that I never answer, because [generic privacy statement] and because I use a cryptagraphically secure password manager. As I did not save the personal questions I answered when signing up (tbh I probably just put garbage, as those are usually never asked when you know the password), and now I just cannot access it.

That's right, I own the email address and I know the password, and yet I cannot access my account. However, knowing who was my best friend when I was a teenager, or what was the name of my first pet are questions, in spite of being known by dozens of friends or acquaintances, that Apple requests as security measures needed to trust me as the owner of the acount. Having them on the phone provides zero help, 1 year later, I still cannot access it. It's definitively lost, and I feel happy I do not have any important information stored on the apple cloud.