It's big business, has been for almost 5,000 years, and keeping the mysteries alive keeps the money flowing to the cult of Kufu or the modern equivalent.
History for Granite ( https://www.youtube.com/@HistoryforGRANITE ) touches on this powerful explanation for several observable aspects of these ancient sites that otherwise defy explanation. The top of The Great Pyramid was likely flattened so that rich visitors could pay to have an unforgettable picnic at the top. Many passages were filled up with sand and rubble because guides didn't enjoy the extra time and effort in hot dark bat infested areas that tourists demanded. And so on. Zahi is carrying on a long tradition.