GPS is very time oriented as well. That's part of how the calculations are done. Using the difference in times, triangulation Etc to figure out where you are. Which is exactly how this system will work as well.
Yes it's not global. But then it was never claimed to be. Yes it will likely only be a North American deal. But it will provide a usable alternative here to GPS. Other regions could adapt it to their broadcast standards as well. As you pointed out it's just timing information. So any broadcast system could make use of a system similar to this. Functioning similarly to gps.
What do you mean? Musk worked hard to get where he is. How easy do you think it is to steal emeralds from your father and pawn them to get seed money to start your own wealth? /s