Why can the livable Blue Whale Bay only handle telecom broadband, and the price is high?

There are generally two kinds of situations. First, the property company signed an exclusive agreement with telecom, and other operators are not allowed to enter. This can only be solved by the property company, or the property company can stop the infringement of the owner's right to choose through the industry Committee. Second, there is only one telecom operator here, and other operators have not included this place in the network coverage, so they can only use telecom broadband.