Those markets are pretty "winner takes most". Not quite sure if I would call it a monopoly per say as anyone can compete but few can scale close. I would expec

Those markets are pretty "winner takes most". Not quite sure if I would call it a monopoly per say as anyone can compete but few can scale close. I would expect most would agree the network effect serves them well - although all may fall in the face of a new competitor who actually manages to be "better" - especially if they do something stupid.