Which is basically blackmail. Unions tend to make things worse in the long run.

If you don't like the company find a job that gives you a better deal.

I think you radically underestimate how over staffed these firms are. The only sorry of strike that could harm Facebook is if the SREs actually shut down all the servers. But you can get DevOps people anywhere and management there is technical do could easily run the firm themselves for a while. All the strikers would do is get themselves fired