For the ICO, there's no need to do this. I think there were projects before that aimed to help the agricultural sector and economy by providing their tokens but it wasn't really effective and useful at all. It was abused and just became a source of wealth collection for the side of the developers.
Yes,this method of raising funds was very discredited by various types of SCAM, which were very common earlier, but if various guarantees of the return of funds, with competent white paper, in a painted financial plan, are provided, then this can be very good.
I thought a lot about that. This is the most complicated thing for me is how to give and keep guarantees of the return of funds. I thought about smart ETH contracts but I have no idea how to create system of returning based on ETH.
I know how to return funds only if I use cryptomining. But for mining it needs electricity. I have a some cheap electricity (about 20kW). And I can get electricity from biogas but it is complicated project which also needs money.