I can't say about Atlanta specifically, but generally you'll want to check the local municipality web site that the property resides in for any short-term regulations, as well as the HOA if the property belongs to one.  

It would in theory be great for STR income by limiting supply, I’d think.We foresee buying and holding indefinitely, but of course we are also thinking about exit strategies should something catastrophic happen.

Our Ideal investment would be as follows (for context)Find an ideal investmentPartner A & B both review and agree on investmentPartner A or b or A and B apply for mortgage on investment (please advise on this)Partner A supplies down payment on investmentPartner B supplies all labor and materials to repair, rehab.

I thought the landlord usually supplies at least the oven and frig.Thanks in advance!

My basis for this is cheap money, overly compressed cap rates, ending or moratoriums, supply & logistics issues, etc.

I would say check local regulations and permitting for short-term rentals.

They are regulated in the same fashion as big banks and brokerages.I suspect  anything you may see that is referring to "scammy" activity involves an investment provider recommending the us of a self-directed IRA to participate in their "opportunity". 

But do keep in mind the basics of economics of supply and demand.

2) Are there any Ohio specific regulations I need to be aware of?

What is the best way to monitor the consumption of these supplies ?