Why would they unionize when most of their comp is stock? The fear mongering, uncertainty and doubt stoked by their CEO's fully-owned press[1] would tank their stock value.
So they can fight back against before forced into the office 3 days per week?
People have democracy in the personal lives, but not in the workspace. Unions give the workers democratic power so they can collectively make demands of the business owners. They can also demand a greater share of profits.
1. https://www.nytimes.com/2023/07/22/business/media/jeff-bezos...