OpenTable is a non-government sponsored monopoly. Every Restaurant owner i know hates their ass because they have a monopoly on the online reservation system and they extract way more surplus value from them via economic rents than they deserve and they can't NOT use them. Open Table's monopoly is due to the network effect.
http://www.reddit.com/r/Economics/comments/eajrd/the_open_table_service_a_simple_example/
So opentable, a first entrant to new market has gained large(90%) market share for their services. Not exactly a monopoly and they are already facing serious competition as others enter this space. They will only keep this share if they earn it.