Probably the same reason the people who still work at twitter show up, it's either some weird sense of loyalty or perhaps it helps them feel like part of the "those who grind" clique.
I sympathize the Twitter workers that are on work visas. Much harder for them to jump ship. They have to tolerate the nonsense or relocate back to their home country. Especially difficult if you own a home and/or have a family.
All that plus interviewing is broken as shit. Then just the thought of changing jobs is stressful enough, but looking for work while Elmo is breathing down your neck has to be some next level stress. I can see where they would be paralyzed into staying a while.
I dunno man, people are weird.