More chicken little?
Does it seem at all that people are crying over their spilled milk? Four year olds could code a new messaging app, messaging is nothing new. However, the merging of users in established platforms is the thing. If you can move audiences, you can create more spaces to advertise.
Facebook never has been in it for anything but making money, and some people who are saying “anti-trust” are simply late for the party or incapable of sending out the invites to it.