It's obviously a heightened risk, but how much riskier?

I see heightened risks with STRs (increased regulation, additional taxes, far more sensitive to recessions and natural disasters), but I guess that's part of the reason you're seeing good returns.I don't know what selling platforms exist for STRs.

For this severe of a crash barter and/or having your own food and water supply would likely be the only reasonable things to do.For a milder crash owning cash is bad if there is heightened inflation.

What you get in upside on your investment you pay for in a lack of liquidity, heightened risk, or in some other manner by seeking yields with less experienced sponsors, riskier assets with higher dispersions of return, etc. 

Each subsequent violation should increase the verbiage to imply heightened severity.

In fact, it puts you in a worse position because the legal expectations are heightened because you become a "professional".You are far better off saving your time and money and instead build relationships with expert agents in your area.

But I believe people are becoming more confident in putting their money into real estate which is heightening the demand and prices.

Taking half the first month’s rent, when the property is rented, reflects the heightened activity during this phase of management.

This is standard practice for the funding platforms that are doing the right way IMO.  506(b) can be used by the portals, but many that are using this exemption are arguably advertising and should be using heightened screening procedures.  

Sorry, I sense your heightened level of frustration.Ironically, I just responded to the below post from @spencer sutton at the link shown regarding Alabama.