Marketing? Legal? Support? Design? Tons more. This is a super mass market consumer service.
What are the others in the 'tons' more category, not part of any of the categories I have mentioned? It may be a super mass market consumer service but part of the reason it's so highly valued is the efficiencies of scale it brings to these things.
I work at tech company you've probably heard of (consumer-focused, international, relatively large scale, though probably a couple orders of magnitude smaller than Uber). We have ~200 engineers (client, backend, ops/infra, data eng, ML, etc). We have ~15-20 designers. We're international but we do very little feature and/or design customization per market, beyond localization, unlike Uber, which does customization even for different cities in the same state, let alone separate countries!