As someone said on the earlier thread: "I'd be happy to pay for it, I just don't want to give my email".
One, a Gmail that I’ve had forever, is my “public” email that’s just filled with junk.
The other is used for stuff like banks, utilities, etc. and I protect it fiercely from spam of any kind.
It’s easy to know what to pay attention to that way and made my life more enjoyable, or at least easier to parse.
For services and what not I know and trust I go with a regular alias with my domain for this purpose. And I have service specific aliases such as foo@example,com so I can delete the alias if necessary which is rare.
Then there the quick thing that you can do with any address for separation of concerns with foo+bar@example.com so if your email address is foo@example.com, just make a quick and dirty instant alias by signing up with, say, foo+bar@gmail.com.