RoboPond: You said (or as it came across as) is GOG would not support games on their platform unless they worked straight away under 10. And that if they didn't to contact support.
I should've written it more detailed, but thought it was clear in the context of what I've quoted...
New try: GOG supports games to run under Windows 10 (as is) when that is mentioned on the game card. They do so because they've tested it.
RoboPond: I said that GOG support them because they run fine under 7, not because they run fine under 10.
Do you have a source for that?
There are several games in the GOG catalogue that are supported under 7 but not 10.