I have, and when it happens, the company responsible loses my business.

I have.

No story to it, don't recall. Just killed the alias and moved on.

Yes. My system wasn’t compromised. They just put my address as their From: address. I got bounces.

I got a pump and dump scam from an alias that I only used for my brokerage account. They assured me it wasn't them. A week later they publicly announced that they were hacked.

Not yet, but oddly I wait in anticipation.

I've been using email aliases for a few years now, but all spam I get is addressed to my main email (which admittedly is readily available on my website). Seems like no one has sold my email address yet

Yup, with my bank account

Yep! Only about twice in several years though. Sometimes it's the same company that started up or bough another company and gave your email without telling you.

Yeah, but it's mostly the ones you'd expect.

It generally wasn't real known brands. They just spam you with their own nonsense.

Disney

I have a few times. I made an email service that only uses aliases called Port87. Now I can just block the alias when it starts to get spam.

Once, way back when I still used Hotmail. It's what made me stop using Hotmail.

Not that I am aware of. Though one time someone made a Facebook account using my email. I was able to log in by requesting a password reset, then I posted a status message (or whatever) that said "Get your own goddamn email" and then changed to the password to gibberish and filed a account deletion request.