Games. Hmmm, not really my thing, but a long time ago I played a game about Hacking and once I had an idea to make a console-like, low-graphics, linux-like console. I looked online and there is something similar. Unfortunately, the rest of the games require a graphics engine to make money. Probably a board game.
tools? Hmmm, it had to be something new, mostly invented and hard to get on the market.
Commercial? This is the best money you can make as long as you hit the 10 or do something better, fresher with new options than the competition. This is what he writes now. Will it work? Time will tell.
Platform? Yes, Mastodon is an example. Something great came out of a small project. I'm always into creating something against big corporations. Mastodon is a cool example of this.
open source / close ? People like open source, but I don't think it always comes with money.
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