The issue I’m seeing with any free plans of email providers is that they either require an identifying verification, or don’t allow the email to be used for services.
tutamail, for example, states that the free plan is not to be used to signup for services.
protonmail requires verification by email ‘to prove you are human’.
Thank you
Considering I signed up for Piefed and Lemmy with a tutamail account, I think maybe you’re not reading that correctly.
There’s a 24 or 72 hour cooldown period where you can’t just go an immediately sign up for things, but that’s about all.