They can't simply by additional 2%
The board could decide to kill the company in MS not only loses a 10 billion invest but has to reconsider its whole artificial intelligence integration push.
MS did have the leverage, and by offering jobs to 700 people at once they felt safe in their move to pressure the board in a way that I'm still quite impressed by. It's probably the most vivid example of the power of the workforce in the 21st century West.