The actual patent talks a lot about NIST GPS clocks, and not so much about atomic clocks. Never trust a headline. Gell Mann Amnesia Effect in full play here.
Sure. You can't get roof access (for a gps antenna) or a vendor ptp feed in every exchange. In those places, you get a rubidium decay stratum 0 timesource.
Not all businesses can afford this, but it is only 4 or 5x the price of a normal GPS timesource, which is affordable for the right people.
