Nah, advertisers (and people as it turns out) don't want to be on a toxic platform where they're constantly harassed. Advertisers don't want to be seen as endorsing the cesspool. This isn't about free speech, it's about being free from constant harassment and people not wanting to swim in the sewer. Musk has turned xitter into 4chan: sure teenage boys like that kind of thing, but pretty much everyone else finds it unpleasant which is why they're leaving.