Governments aren't going to be buying GPUs in that quantity. What on earth for? And the crypto mining market is (fortunately) toast in the medium term, which gives time for proof-of-waste to be banned.
Physics and chemistry modeling, economic modeling, cryptanalysis, face/posture/gait recognition and behavior prediction, spatial inference and geolocation from video, autonomous drone swarms, war gaming, forest management, code enforcement, space object tracking, training simulations...