There’s two types of employees. Those who have other options, and those who don’t. Presumably Musk just got rid of people he found useless, so he must now be looking for people who are useful. Such people will be able to negotiate.
Oh sure, but if you’re being headhunted, you’re not likely to switch to a company with an uncertain future unless the pay premium is worth it, or there’s some other perk that makes it worthwhile for you.
I assume that Twitter is targeting high performers here. If not, they should have just kept the staff they had.