WHY do you REQUIRE that I install APPLE software on my MICROSOFT system to manage Apple subscriptions? I REFUSE to install software so I can delete it 5 minutes later! This could be offered via a web interface!

This is a user to user forum. You are not addressing Apple here. As users like yourself, we do not require anything.

Apple subscriptions would require that same Apple software to be accessed, so it's reasonable to expect the Apple software is required to cancel them.

Otherwise, how are you accessing the Apple subscriptions you want to cancel?