I don't know GP's situation. But in the case of the linked article, given anthropic's tie to the Bay Area "rationalist" community, one possible reason why the author has a roommate is he bought in to the rationalist "group house" culture and moved in with one of them.

Product managers aren't management. They manage the trajectory of a software initiative. They can be hired straight out of college.

Rents in the San Francisco Bay area are too high to live a practical distance from job centers as a junior without roommates.

What? Plenty of people prefer to live with roommates, especially in the bay.

It is literally impossible to prove a negative, that’s how conspiracy thinking operates and it’s why fortunately the justice system operates on the opposite principle and requires proof of guilt.

It’s true that in some circumstances we require avoiding even the appearance of impropriety or a conflict of interest, but that’s simply too large a burden to impose on everyone all of the time, especially for allegedly dire sins like “having a roommate who works for a Google”