With all due respect, Varig md-11, I think that your argument is not well-founded:
Using your argument, LH, BA, AF, OS, AZ, (AY), etc. (airlines from the EU memberstates)..., then make up one sort of airlines from 'one block of countries' 'cos they are all in the EU, and there's a lot of things that IN THIS CASE kind of make the EU one block (you might know better than myself about this, 'cos you're French and France is a EU memberstate)!
With regards to DXB being a hub for onward/inbound connecting traffic to/from Oz, is it the case that AF does not sell tickets for AF flights to pax. from DXB who want to fly on to North America, South America and other smaller destinations (in Europe, certain parts of Africa, & elsewhere) and v.v.?? I do not think so.
With regards to the EK flights to Nice, I think that DXB is not the only AF destination in the UAE... I have the impression that AF flies to AUH too, though I stand to be corrected on this point. So in this case, it is also a case of being on an equal footing, ...but what's maybe tilting the scale is (and here I stand to be corrected) that DXB has an openskies policy, whereas at CDG, things are different.
Of course, if Dubai has an openskies policy, whilst France does not, the French people are sovereign too, and they are free to go for this policy, 'cos after all, they are as sovereign as any other state.
So I think that the crux of the argument is that AF and perhaps (probably) with the 'backing' of the French authorities, fear the strong competition that EK would introduce whilst adding more services. This, in my opinion, is yet another case of protectionism.