For quite some time (approx 8 years) I've used an email forwarding (Blur, but any works) to avoid spam.

This looks like perfect case for change of email, since lot of these accounts can be moved out from Gmail by changing the address that email is forwarded too.

Looks like all this hassle with generating a new email for each service pays for the second time (by ease of changing the main mail), in addition to spam and privacy protection.