As a class. Individually they're absolutely powerless and class solidarity is very difficult to achieve, perhaps impossible. There's a reason labor movements tend to involve elements that physically coerce other members of the class (i.e., 'scabs') from crossing picket lines. Capitalists don't need very many specific members of the proletariat, they just need enough. Musk can fire his critics at will for a very long time without any real threat to his business unless his employees and any potential employees were to coalesce and oppose him en masse.

I doubt that they will do this. If I were in Musk's position I'd fire these people and I'd fire similar critics at twitter. Capitalist led enterprises are essentially monarchical. I don't like this but it is reality and it's best if everyone understands it. I prefer mask off to the alternative.