But it's not even remotely guaranteed that it will add value to the ecosystem. The only example you have given is one of student loans. I'm not aware of any others.
You either get a loan that you have to pay back with interest, or you sell a stake in your company to investors who are willing to risk not getting their investment back, for the chance of handsome rewards if it succeeds, but this proposal expects a loan they might not have to pay back, but without offering a % cut if it does. Have cake and eat it. No thanks