You get your ISPs email address, and you could have your Google address, what else?

I host my own email. I have literally billions of email addresses available if I want them and getting billions more only costs however much I can get a new domain registration for, which isn't often more than $10. I already own a dozen domains or more and I can have any username I want at any of those domains for any email at no additional cost.

Now I'm not some dickhead harassing people online or spamming discord servers, but I will admit that Wendy's once had a deal where you could get a free frosty for creating a new account and I had free frosty coupons for weeks before they realized that email only verification for unique users was a losing proposition and they switched to requiring that new accounts attach a phone number.

Email verification only works if you've got nothing to lose. As soon as there's anything on the line, you'd better look for something more concrete like a phone number, a credit card, or a government ID. Personally I'm more comfortable with Discord having one of those pieces of info before the other two, but that's just me, you do you.