TO be honest, most land in my area is owned by private individuals but normally with the required government ...However, LandDao representatives will do in-depth research on the said place and also ask locals around for any hidden information's...
On a norms, regardless of whether a land is own by am individual or firm the owner must undergo an approval by the government (certificate of owner) that consent is required in a case where there's a future transfer of ownership, I believe that why LandDao has made it compulsory that they'll only acquire lands that's registered by the government which is very important for security reasons, having the appropriate document of ownership would even make it easier for the representative of LandDao to the fully convinced in purchasing your land, therefore anyone that's got a land for sale and might likely want to sale to LandDao in future or near future should ensure that they have the appropriate documentation concerning owner of the land.