I'd love to but I'm not really at a point in my life where I can do a whole project full time for fun :) Since it'd be cloud based (as you'd be doing things which would be dangerous to do on your home system, under time pressure) it'd have running costs, and I expect the security aspect to be tricky.
I wish I could, but Kickstarter is US only. The alternative, invested.in doesn't look that strong.
I think you're right that it's a model that would work well - if I could raise the money to code it I'd happily make it open source after that (running costs means it'd have to cost something to use on someone's server).
I'm not sure exactly what you are looking for, but IndieGoGo has had a lot of successful non-US projects. Community is building every day, and the payment options (e.g. PayPal & direct credit card) are not US only. Check it out.
Re free - if I raise the money to cover my living costs, I'll make the game open source. You'll easily be able to spin it up on a VM/cloud server (or your home comp if you're brave/foolish) for free! What's better, is that you'd be able to modify to teach your own language/project.