Also, how would you ever enforce such a prohibition?

Some people like that-others don't:)They are prohibited in CA--too many questionable people I guess:)

This case has been reopened.Clear Cooperation policy — which had been dismissed in 2021 — will be able to proceed.December 21, 2023Robert Davis Real Estate NewsCalifornia District Judge Vince Chhabria agreed to reopen a lawsuit against the National Association of Realtors that seeks to prohibit agents from selling so-called "pocket listings," or properties that are not listed for sale on the MLS.Background: Private listing service Top Agent Network sued NAR in May 2020, challenging the organization's Clear Cooperation policy, which states that an agent or broker must submit their listing to the MLS within one day of marketing the property to the public.

Using personal funds to cover these expenses could result in a prohibited transaction.

Each warranty made herein survives the closing of this transaction PROHIBITION: this agreement established a prohibition against transfer, conveyance or encumbrance to the property.Now I am not a lawyer and neither are my partners, but when we read this we see that this company feels they should be paid despite if they find a buyer or not.  

Examples:  Smoking is prohibited in the unit.

The reason to not rezone is the need to build a lift station, which would make this cost prohibitive. 

After digging into it for some time, I think it's safe to say that the choices are slim to none - there are some relatively cheap (sometimes free) data sources that are very poor quality, and the good quality data is prohibitively expensive (House Canary charges $1 per API call - WOW). 

@Hari Sarvotama You didn’t mention where you’re located and that can make a difference.For example, in my state (like most states), there’s no state law that prohibits a landlord from collecting multiple applications and then selecting the most qualified applicant.

I can simply not expend that amount of time getting that deep into multiple markets throughout the USA and cost involved is quite prohibitive to get a full understanding.