What surprises me is that the discussion here is taking the original article at face value. Sure, the Indian govt is citing national security as the reason for the ban. But take a slightly cynical view, and focus your attention on this sentence: "Jayanth Kolla, an analyst at research firm Convergence Catalyst, told TechCrunch the move was surprising and will have huge impact on Chinese firms, many of which count Indi…
It's probable that the border issue made them more willing to take actions that they might normally avoid in fears of unnecessarily angering China. I think of it less as pure posturing and more as, if we're already in a border dispute we might as well take the opportunity to do some things we planned to but put off.