Why there is no "Forgot Email"?

I noticed, if you forget your password, you need to click "Forgot Password". But if no other way while that multiple email address inputs still doesn't work. They don't provide us an access to Account Recovery Link.

In Twitter, if you forgot your email (number and username), they don't have an access to recover your account.

In Instagram, they don't have account recovery link either.

Good thing with Facebook, they allow you to "recover" your account if you missed your email.