You have someone going to stay in close proximity to an aging relative with temporary health issues because they can WFH while doing so. 

Take care of long term health care needs.8.  

And of course the government knew what was going on and turned a blind eye in the interest of keeping the US health system going.

Well a major problem here in the US is the sense of entitlement...entitled to own a affordable house where you want it to be, entitled to be paid a "living wage", entitled to have college debt cancelled, entitled to free food, entitled to free health care - the list goes on The free-market is the best system the world has ever seen.

Quote from @Roger Paschal: Quote from @Stacie Smith Equity Assurance, LLC, offers insurance for the due on sale clause.Thank you Stacie for the plug for Equity Assurance, in over 4 years of offering our services we have never had a foreclosure because of the Due on Sale Clause.Also with almost 20 years of doing Subject 2 deals myself never have I had a bank follow thru with a foreclosure threat, yes they have called and I am sure they will continue to call in the future, that is their job is to make sure all is correct and the investors job to make sure all their ducks are in a row.With Equity Assurance, our goal is to make sure the investor is educated and the seller has all the correct information and disclosure on how this process works.We are now offering some online courses and documents to make sure the Investor is doing this process correctly.We are also slowly changing our name from Equity Assurance to Subject2Institute.com to eliminate some of the confusion, we are not an official Insurance Policy we offer peace of mind for the seller if the investor needs this to make the sale. 

First I would check with zoning and the Dept of Health to see if the property is allowed to be such and if you need a license for doing so.

When at your home they approach you aggressively and make threatening comments; send harassing emails; don't allow peaceful enjoyment of your home; forced to move into a hotel due to their threats; spoke with officer XYZ on this date and he was concerned enough for my physical safety that he offered me a police escort just to enter my own home...You can also try to contact them and offer to break the lease with no penalty.

My next hope is to get the owners to do something, and as they've been ignoring the problem this whole time we (the neighbors) are hoping a lawsuit threat would prod them to sell the property or somehow take care of it. 

I don't think there is a big foreclosure threat.

people teaching others how to do what they do, will never pose a threat to their own livelihood (re: competition). this is because for every 20 people who sign up for a course like this, maybe 1 will actually do something significant with it, and they won't be able to bring the special sauce that is pace morby (for example)'s personal touch.