We Can Also use protonmail Service instead of gmail and yahoo because protonmail is also decentralized
You have no idea what you're talking about. That's not a decentralized email provider.
Protomail is Swiss based and a encrypted email. You have 2 passwords, the first one is used to log in (which is logged into their servers), and a auth password which is not. If you lose your auth password they can't recover it.
i've recently seen a demo of a site that uses your cellphone number and OTP for logins.
Bit-x uses a cellphone number for logging in.