.eu allows partial WHOIS privacy, and what can be hidden is different for individuals vs companies. If you go to this page and click on “PARTIAL WHOIS PRIVACY” you’ll see exactly what. Unfortunately it looks like the email address is exposed for individuals, which is dumb.

You can look into getting a domain from a member of the European Union, they typically have better protection, but make sure to verify on Netim. For example .nl domains have full protection built-in.

For domains that don’t have it you can use a privacy service if the registrar offers it, they will put their own data in the fields that must be disclosed. I’m guessing Porkbun doesn’t.