In a nutshell: You can track load time of your site. If (e.g.) NBC homepage has videos of X, Y, and Z on their homepage, you can simply embed those same videos

In a nutshell: You can track load time of your site. If (e.g.) NBC homepage has videos of X, Y, and Z on their homepage, you can simply embed those same videos on your site. Does your page take <0.1s to load? The cache was hit which means the user probably visited NBC recently. We can’t have nice things because people figure out how to use them to track people.