You're arguing with a logical fallacy (the false cause fallacy).
Claim: There is no innovation in mobile OSs in New Delhi or New Zealand.
Implied reasoning: These places don’t have the DMA.
Conclusion: Therefore, the DMA is not a factor in hampering mobile OS innovation.
That is a logical fallacy; correlation does not imply causation. Innovation depends on many factors like market size, capital, and infrastructure. You can’t draw a global conclusion from two unrelated examples. And, the fact that China and the US are pumping out tons of innovation while the EU is having former government heads write detailed reports explaining why the EU is doing such a bad job at innovating (across multiple sectors, not just tech), is a pretty strong indicator that there's an innovation problem.
So the EU thinks there is a problem with EU innovation, and said report states "The EU’s extensive and stringent regulatory environment (exemplified by policies based on the precautionary principle) may, as a side effect, restrain innovation."
But sure, the lack of your narrow definition of innovation in Cambodia means that logical fallacies don't matter anymore.