Seems to me that if one was running a spy agency like, say, the CIA or something, it’d be a very useful move to get one of your employees to get a job at one of those companies, so that in addition to ones own spying, one could also piggyback off the spy infrastructure of the ad companies. I imagine the government might get some of that information already, but if you were a foreign government, or trying to get info you weren’t technically supposed to have, I can imagine it might make a lot of sense
They don’t need to “get someone on the inside”, they have been using FISA and Section 702 for decades. Plus the Prism project that got leaked by Snowden.
Yeah that works if it’s a company in your jurisdiction, but for countries like Russia it’s probably an easy win to just have someone on the inside who can look up whatever you want. Probably costs a lot less to maintain as well, if you’re after individual targets and not casting a wide net.