Because the collective bargaining power of people who prefer to work in offices has been shattered and the remote workforce is fighting back as a collective. There's a lot of drama because the stakes are incredibly high. Pro-office workers had successfully promoted the idea that their model of work should be subsidised by an average of 10 hours a week of unpaid labour (called commuting) and massive government infrastructure spending. That is asking workers to sacrifice north of a year of their lives unpaid. Somebody going from a WFH job to a 1 hour commute at the same salary is de facto taking a massive hourly paycut in the middle of high inflation while having their work hours greatly extended. It's easier to push for a change in work conditions than an increase in pay because working in an office is such a massive inefficiency that cutting it is the easiest place for a company to save money. "Voting with your feet" is less useful than getting a bunch of others to vote with theirs.

Collective action being used to bargain a better deal for workers is a simple enough concept.