There are old DOS programs running clipper or controlling devices than one might think.
Being able to legally do something more with them may be useful to some.
I love it nostalgically (and I actually enjoyed using it back in the days), many people still use some flavor of DOS e.g. in supermarkets and post offices. I believe there is a lot of old hardware that is only compatible with DOS still in use.
In 2006 I worked at a dry-cleaner/laundromat that had its computer system all running on DOS. I remember when the computer died one day, my boss went to the local thrift store and found a computer old enough to just move the drive over and keep things running. I thought it was odd, but it worked great! Kept us from using it to play games :)
Up until about 10 years ago the ordering system at all the Domino's pizza stores was running either on a DOS or a Win95 machine in a dos window. They manage to patch it to the point it could take internet orders over, what I think was, a virtual modem controlled by a helper windows program.