I have mentioned this long time ago and would do so again: No matter how righteous be the cause, threatening your employers and instigating a mutinous conduct with fellow employees doesn't go down too well.
Both sides could have done better. Both sides includes Timnit's subsequent conduct as well.
I interpreted "with fellow employees" as in cooperation with fellow employees, so that wouldn't be a one-person strike. Although I guess it could be interpreted as against fellow employees.
In this case, I think the initial ultimatum delivered to management was in the vein of “I will quit if you don’t do X” (not “we will quit”), but she was also trying to collaborate/mobilize with others in the company to pressure management. So a bit of both?
