Maybe one way to do this, would be to make a "startup coupon" system. Where people would actually donate real money, which become coupons for whichever startup

Maybe one way to do this, would be to make a "startup coupon" system. Where people would actually donate real money, which become coupons for whichever startups you want to support. And once the startup is running, the actual money would be deposited to the company, and users can redeem their coupons.