> Who are we to believe - the repliers, or our own lying eyes?

Believe the repliers: I created an account in May 2024 and I have not added a phone number. Here's a screenshot from my settings: https://imgur.com/a/Q7kJpDv

But also, your eyes aren't lying to you: some servers require accounts to have confirmed phone number in order to join. So there is probably a lot of people who have had the experience of creating a Discord account, trying to join a server / accept an invite, and immediately seeing a "you must provide a phone number" prompt.