What email was suspicious? From what I can read. Proton provided the Spanish authorities with a recovery email address, which the latter then used to find an associated Apple account.
While I agree this makes Proton unreliable for many things, there's no indication they were reading any emails.
No service can read all emails of a platform, but spying is still not good anyway, if someone is misleading it's a government problem to find and punish them, communication should be safe anyway, old face-to-face communication is good then internet.
While I agree this makes Proton unreliable for many things, there's no indication they were reading any emails.