Is there anything stopping me and a bunch of my friends from sharing one copy of the Turbo Tax software?
When I was a young man, I and my siblings just used my parent's copy of the turbo tax software so I don't see why this would be any different.
Pretty much nothing is stopping you
the software doesn't restrict how many paper returns you can print out, and it's not gonna call the cops on you
however, it may restrict installation to one computer or something