That’s not enteirly true. In London all my favourite places are only on Deliveroo, and not on Uber Eats (at least in my area). Maybe the have some kind of exclusive contracts?
UAE has weird bans on many VOIP solutions, also VPNs are in a bit grey area - I guess that would make remote work too problematic with the tools they use internaly.
interesting to see it's a "team effort" and not a rat race between individuals like in many other tech companies