I guess the real question is whether this is cheaper than to just license these services.
And a second question: how much power do others have over you? I'd your agricultural output or tax system becomes dependent on a certain provider/country they have a lot of leeway over you. Same reason Europe and Russia and China built their own satellite-based positioning system: can't trust the US to keep GPS accessible.
On the other hand any satellite built for you might have the same issue through some hidden software-based off switches.