The answer is "none of the above": instead, antitrust regulators in the US (after Jan. 20) and the EU force the breakup of Facebook, restoring WhatsApp's status as an independent company focused on privacy. The WhatsApp users get to keep their preferred platform and Facebook doesn't get the data.
I'd like to get people to use Signal, but it has been a losing effort. I either need to use WhatsApp or not communicate with friends and family. That's the problem with network effects.
