Having identifiers where anyone can initiate conversation is the problem. Modern messengers like Signal or SimpleX allow you to share one-time contact info, completely preventing anyone you don't allow to contact you.

Besides that, people should sign up with random email aliases just as much as they sign up with random passwords.

Here is a free crossplatform workflow: New, free Proton Mail[1]-->Free Bitwarden[2] account with single master password memorized[3]-->duck.com[4] alias pointing at Proton Mail-->Extract[5] duck.com api key to generate random duck.com alias for each site in Bitwarden-->Sign up for new service using new random email+password in seconds and never have to remember it and no spam.

Here is a simple crossplatform workflow: Paid proton suite[6]-->Single memorized master password[3]-->Generate random email alias and password for new services using proton pass.

If you use iCloud+ you can generate email aliases using a Raycast[7] extension or a browser extension[8] or inside of safari natively. There is also iCloud+ settings, but that is a pain to get to.

[1] https://proton.me/mail

[2] https://bitwarden.com/go/start-free

[3] https://strongphrase.net

[4] https://duckduckgo.com/email

[5] https://bitwarden.com/blog/how-to-use-the-bitwarden-forwarde...

[6] https://proton.me/mail/pricing

[7] https://www.raycast.com/svenhofman/hidemyemail

[8] https://chromewebstore.google.com/detail/icloud-hide-my-emai...