Minimum system requirements:
Broadband Internet connection ???
Does that mean that I can't play offline?
It can't be for downloading the game, since all games need downloading, and others don't have that requirement listed.
Someone else suggested it is a check against the real date online, looking up a server. Fine, but what happens if that connection or server dies? Will the game stop working? If so, that's not DRM-free (in the sense that the game requires online connection to another service in order to run).
If the game runs even if it can't connect to a date server (in which case probably using the local clock) then a Broadband Internet connection _isn't_ a requirement. So either way, there's something weird there.
My PC is set up so that no software can call out through a firewall except the few things I specifically allow: email, browser, Steam client (boo hiss). I don't allow spyware, secret messages, server checks and DRM. Because I have a secure PC, crud like Denuvo doesn't work at all - that is designed specifically to do things behind your back.
So with this game, it comes down to: what happens if this single player can't contact a server (since it wouldn't be able to on my PC). If is refuses to run, then it shouldn't be on GOG. If it runs okay, then the broadband connection isn't a requirement and should be removed from the listing.