Cameras on rocket launches are there to evaluate performance and observe potential problems. They are also helpful for public relations. They rarely have a camera looking up because there is usually nothing important, useful, or interesting.
Flat-Earthers claim that there is no front camera in rocket launches because “they are hiding something.” In reality, a few launches have a front camera like the Space Shuttle STS-133 mission above & it is as unremarkable as anyone would expect.
Original Video
References
- Was an onboard camera during a rocket launch ever pointing to the side rather than down? – Space Exploration Stack Exchange