Yes, like the seemingly-little-known gmail aliases.
I have my @mac.com and use it for some things, but went heavy on gmail aliases - if you are
user@gmail.com, you can insert +<more>, e.g.
user+banking@gmail.com and it will accept and route to your gmail
user@gmail.com account. With a little more work, you can add folders and filter, and allow sending outbound as any of your aliases, which now effectively have their own ‘inboxes.’
With what seems to be a huge PITA each time I do it, you can also get it working in Mail.app across Macs, i
pads and iPhones.
Don’t get me wrong, google has become pretty evil in their data collection although Facebook remains ‘king’ there. I used to run several of my own domains and mail, and may wind up back there at some point but I’ve had my gmail and @mac.com for ‘quite a while’ while life is busy enough to change something working well enough for now. I pretty much never use the gmail app or web interface and the icloud webmail last
i looked was just kinda sad, but Mail generally works well enough.