It'd be nice if I could align my identity to my service provider: gmail for Google, iCloud for Apple; and ... Amazon-mail for Amazon; hulu mail for Hulu? AT&T-m

It'd be nice if I could align my identity to my service provider: gmail for Google, iCloud for Apple; and ... Amazon-mail for Amazon; hulu mail for Hulu? AT&T-mail, .. For the "big" players it seems it'd be eaay enough for me to use a keychain application synchronized across multiple 3rd-party platforms. This would let me define my "total" identity privately (in my personal keychain) without having to worry about cross-vendor contamination. The hide-my-email hack from iCloud is not a "real" substitute. A change-in-behavior from Apple would cause issues everywhere else. This really feels like a place a co-op or a govt agency with incentives aligned to its members could really help... Alternately, a bit of legislation requiring email-less account generation, or allowing credit card providers to enforce such provisions would work.