This is a switch to “advertisers choosing not to advertise with Twitter is free speech”. That is different than “activists engaging in collective action to thr

This is a switch to “advertisers choosing not to advertise with Twitter is free speech”. That is different than “activists engaging in collective action to threaten advertisers to compel them to boycott Twitter are merely criticizing Musk” As to legality, that will depend on the specific wording they used to compel the advertisers.