Probably environmental data, mainly temperature, and of course, they get to see how it progressively fails. They're starting to see some temperature sensor and battery issues for instance.
I took a look at the press releases and I can't see a lot of information about payloads, but if they're operations were anything like Nova-C (which I worked on), then they generated lots more data on landing than they could downlink at the time.
I would guess the main value is in practicing the technological skills of sending a thing to the moon and maintaining connection with it.