The idea is the low-income residents have zero utility bills, allowing them to keep more money in their pocket for things like food, and allowing for more upward mobility.

You take 100% the risk with extremely little reward.

If I could go back I think I would choose East Hill even so, downtown is where all the action is, good food, etc, Pensacola Beach is still close and great.

I love the beauty of the house hack, and the rewards really pay off when it comes time to sell!

What other essential service/goods providers (food/grocers, water, clothing, plumbers/other trades, etc etc) are forced to give away their goods/services for months/years to people who will never pay?  

That which is difficult is always the most rewarding. 

I'm also looking into programs like waste management just started a food composting service so you can get a trash can just for food scraps and they come pick it up just like they do garbage and that's something I would like to cover free of charge for my residents, trying to increase the value of sustainable practices for them.

However, are there any neighborhoods that in your opinion, are totally NOT worth investing in at all from a risk/reward perspective?

I would like to evaluate this in the context of risk vs reward. 

@Jonathan Giglio Food, clothing, SHELTER. 20+ years in the business in all kinds of markets.