There is an abundance of skilled workers who don’t care about this boycott. I personally know quite a few skilled devs who think Zuckerberg taking a stand is a reason to work for Facebook.
If, hypothetically, many skilled workers did care (and didn’t like Zuckerberg’s stance) then they’d lose them, which would impact their performance especially against competitors.
I appreciate that this is highly unlikely to happen since, as you said, many don’t care and in fact see this as a positive. I was just stating that I object to the idea that employees can’t have an impact – they can, in sufficient number. We just need to get them to care (lol).