Elimination of WFH is only one tactic they're employing. Last Friday there was a call informing a number of employees in ATL their jobs are moving to LA. With kids in school, working spouses, etc. you know that only about 20% will end up making the trip. In some orgs the movement to LA has been going on for more than a year now, so they know full well how low the take rate for forced relo is.
Another sneaky but efficient way to get rid of a bunch of employees without paying severance and getting bad rep. AT&T will go as low as it can just to save a few bucks.