On cross examination, the FTC interrogates List’s finding that Google Chrome is the top app users go to when they’re incentivized to spend less time on Facebook. List says he didn’t focus on the app as much as YouTube and TikTok since “it’s a little like off-device time has an infinite number of things you can do.” The FTC seems to be suggesting that this is exactly the point — and why evaluating Facebook’s relevant competitors based on where users shift their time is an imperfect measure.