genuine question for actual flat earthers

I think it's not a controversial opinion to say many countries in the world disagree and oppose each other in so many ways, changing over time with complex relations between each other, internally and externally.

so why is it that every single government, aeronautical company and organisation for which the shape of the earth might be relevant (independent of affiliation or ideology) all agree that the earth is round?

I mean, it's hard to believe on this level of coordination for anything for over a century.

I also don't understand whose interest is to hide the shape of the earth...