Was.
Maybe you are to young to remember the (pre-spam) days when it was polite to leave your SMTP server open for others to use?
Yep. Was.
This isn’t the internet you grow up on. This is an internet scoped for bots and organizations.
Also, I imagine it's not impossible to reliably distinguish between an autopen and genuine handwriting. The company who's site you linked say their machine can't perform complex pen movements so calligraphy is impossible.
The real advantage of posting a letter is that you have to pay for postage, and the stamps on the envelope will indicate which country the letter is really coming from.
Not including the cost of the letter itself, or the envelope, or the cost to write it if it's being farmed out to overseas labour, who then has to send it by international postage. And then you have evidence of where the letter originated, and that can be compared with how the user presents themselves online.
Little bit more than 2 hours minimum wage I think.