My younger brother is into this sort of stuff, for a time, he was hellbent on explaining it to me, and I just kept zoning out... It was really dry stuff
From what I remember, he essentially invests in the development of new properties in Egypt, by putting down a certain percentage of the properties total. Once the properties are built, they of course cant go on the market, unless he (the investor) reneges on his end of the agreement.
Because these properties dont actually exists and Egypt is looking for potential investors for its housing development projects, the market evaluation for these houses are kept low.
The initial investment was two rounds of ~£10K, all in all, a up front cost of ~£25K (after legal fees, taxes, lawyers and so on) for a property.
Why Egypt? Some of our close family live there, £/$ goes further there, and unlike western Europe, there was no interest involved.
This was maybe two years ago though, maybe even before the Russia/NATO war.
Other than contributing to it monthly, I did not pay much attention to it.
If you are interested I could ask my brother and aunt some more about it.