I don't think the backlash was just about the privacy changes. I think the changes were just the straw that broke the camel's back. People have been itching for a catalyst to get their friends and family to migrate away from Facebook's manipulative software to an app that actually respects users and their privacy. It seems like it finally happened. Finally most of the friends I chat with have Signal or Telegram and I can justify deleting WhatsApp and Facebook. I'm hanging on by a thin thread to Instagram because it's the easiest way for me to quickly edit and post my daily photos, but that could very easily be replaced because now it's more about the image editing than the network effects.