I personally had issues with Apple overbilling me and not fixing it, and have shifted away from icloud and it's a huge problem for me, because while most accounts will let me change my email, some accounts will not.
I registered a throwaway domain for $10 and i'm using that domain that's the combination of two random english words dot com, and now I use simpleloginolyourall, but I own the alias domain and I can always redirect it with a catchall if I ever want to switch services or use the address with a different alias email provider.
To be fair, it's not currently that bad, because the minimum price for hidemyemail is a few bucks a month, but apple can always change that and it's far easier to pay for a domain then when you want to switch email providers in the future.