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I think as long as it's just INCOMING email, what's the harm in it?

Isn't Firefox Relay the same, though — you can receive e-mails, but not send unsolicited mail?

You can reply, at least I can with my premium subscription.

People can use it to sign up for things like discord and then use that to spam. Though I guess even Gmail could be used for this

To spam who? How? Sybil attax ?