That seems like an obvious answer (good luck attracting queer employees - and a lot of tech workers are queer - to work in Dubai, despite whatever exemptions they may offer for tech workers) but it seems to be about where the company is incorporated while still being based in India.

So I guess the answer is, as others have pointed out, investors. It's likely easier to expand into Dubai if necessary rather than to reach US investors while incorporated elsewhere. I've certainly seen German startups incorporate in the US (often retroactively) for this reason.