Totally agree. I set this up for myself to have a anything@mytrowawaydomain.com and it's great to see when folks sell your email :)

So far it's only happened once, actually, when Keen.io got bought by a PE firm, I got a bunch of spam, so they clearly sold off my email address.

It's a system that would be hard to operate as a "normal" person, so this is a great step.