Apple recently has gotten lots of issues with antitrust lawsuits, especially in EU. Probably this kind of public campaign will likely draw more attentions from

Apple recently has gotten lots of issues with antitrust lawsuits, especially in EU. Probably this kind of public campaign will likely draw more attentions from other iOS developers who have enough complaints but scared to fight against Apple. And even for Apple, FB (+Instagram and WhatsApp) is not something trivial to crush unlike Epic or Spotify. FB alone might be negotiable, but this can grow into significant headaches for Apple if it lets other Unicorn-level companies to form a coalition with FB or other tech giants.