Because once the pandemic hit, Twitter changed their policy to
https://www.nbcnews.com/tech/tech-news/twitter-employees-can-work-home-forever-ceo-says-n1205346. Twitter still ran fine with that policy. It's pretty crazy to suddenly give workers <12 hours notice that they're suddenly supposed to be in the office. I bet a lot of people relocated to somewhere not within commuting distance.
At my company where we did NOT like remote work before the pandemic, our company changed stances. Now many (most?) teams are ok with some to all remote workers. Office attendance is super low. Some managers and higher up moved out of the area, including my manager. We've hired ICs, management and upper management and they work remotely, from other states. It opened up the pool of applicants to lots of people who didn't want to move to the Bay Area for many reasons (e.g. super expensive here, high taxes, friends, family, etc.)
I live in the SF Bay Area. You do know how much it is to rent or buy a place here, right?
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Since the pandemic started disrupting rental patterns, the city has slowly been losing that reputation.
www.kron4.com