Those are all controlled by three companies, at most: Google (Meet, Hangouts, Allo, Duo), Microsoft (Lync, Skype, Skype for Business, Teams), and whatever compa

Those are all controlled by three companies, at most: Google (Meet, Hangouts, Allo, Duo), Microsoft (Lync, Skype, Skype for Business, Teams), and whatever company controls "Messages".