Not sure why people bother to use the << spam at google's email >> approach when they can use an email forwarding service that lets you turn email addresses off, like https://idbloc.co (disclaimer, I built this)
I typically use throw away email addresses instead since they're free. If I actually want to use the service/account some day I'll sign up properly.
I expect someday the primary email providers will generate aliases on demand.
The example above is about giving a direct line to be contacted through email on a personal site or blog, heck even a professional one.
> I expect someday the primary email providers will generate aliases on demand.
I know at least ProtonMail does it. But also theres the email#tag@gmail.com trick that works nicely enough.
It's not a literal alias, but it works out fine.
One of these days I'm going to propose the Thunderbird + K-9 mail addons that say 'set the sent from email address to be equal to the sent to email address', that way if service@myusername.fastmail.com is the recipient, it will be the sender to any replies, rather than the MUA default replying with myusername@fastmail.com (but that's a separate discussion)
I guess its because they do want legitimate people to reach them easily (students, collaborators etc) and if spams do go through — well they'd probably ignore it, just like they ignore other emails.
I use anti spam addresses to register to new services.