Motion control support on PC is rather rare as almost every PC game uses xinput, and therefore almost every controller will simply identify itself as an Xbox controller for the best compatibility. You basically have to check on a controller by controller basis if and how motion controls can be enabled on PC.
I do know that some of the 8bitdo controllers can be configured to show up as Switch Pro Controllers on PC with working motion controls.
SteamDB gives a value of 2500€, 9500€ if I bought everything with today’s prices, for my library, most of which are from Humble Bundle, and I have probably 150 unredeemed keys as well. I could easily sell 95% of them as I’ve played through them or don’t like them, and net a sizeable profit in the process. And I’m definitely not alone.
They would have to implement some sort of revenue sharing for sure that guaranteed some of the resell value went back to the developer, or this would indeed be the result. Also all bundle/discount sites would die overnight anyway.
Usually yes if you use only numbers, but when you use alpha/beta/release cycles etc, it’s not that uncommon to have them start from 1.0 as well.
As an example, the fifth phase of minecraft dev started with “Minecraft Alpha v1.0.0” and once it got to v1.2.6, the next was “Minecraft Beta v1.0.0”. The proper Minecraft 1.0 came after Beta 1.8.1.