I don't mean to sound rude, but honestly, if this was the team's original idea for YC, then either the two co-founders are extremely qualified and talented, or YC has begun funding moonshots in the dark. It doesn't take much thinking to easily conclude that it's a bad deal for devs.
The last time I found some stats (five years ago), MOST accounts had hundreds of games, most of which were never played (playtime < 2 hours, I think).
Luckily, the developer still got paid. With MagnaPlay, the developers will never get paid unless the game is played.
In other words, this looks like a bad deal for developers, while also looking like a bad deal for gamers![1]
I can't really see any way for this to take off.
[1] For gamers, the DRM is an unnecessary hurdle, and GOG solves that. The lack of titles is also a hurdle (remember, this is only for indie titles).