Average users and devs aren't going to bother with support for relics of the past.
I believe we are sapient species. Thus, there should be a reason for taking one action or the other. And there's literally zero reason to drop OS support in games like this. There's no technology that would make the game greater on W10 than it would be on W7. Doubly so considering the fact that the best systems in such games are hand-crafted and OS-independent. And I believe doing so wasn't a conscious decision in this case -- developer is just sloppy and uncaring.
And yes, I've seen some games in this category, although I wouldn't call it 'hobby'. When you DL 10 of those, 7 will almost guaranteed to be some haphazardly slapped together shovelware, 2 will show promise while being incomplete (or way too short) and 1 will probably be worth your time. In the most fortunate of cases. Hidden gems like Karyn's Prison, The Third Crisis, DoL and some others are well hidden under mountains of shovelware and abandoned projects, and out of 10 games mentioned, there will be none as good.
Now, imagine one of those 10 requiring Win10 to start, PowerShell to patch and other hassles to just try it out. That happens, not all devs are born equally good -- I very much understand and accept that. What I don't is some people coming at others with huge 'why didn't you upgrade, infidel?!' banner. Like I said, total most of games posted here run perfectly on W7. Most of the games not posted here do that as well. You can consider me 'a fanboy' or whatever you like -- this won't change this fact. And it won't change the fact you're not helping anyone with either of that.
Hope I've elaborated my thoughts on the matter thoroughly enough.