For many people (esp. kids and "Disney adults"), Disney{land,world} isn't a type of theme park, it's its own experience that could never be substituted with Six

For many people (esp. kids and "Disney adults"), Disney{land,world} isn't a type of theme park, it's its own experience that could never be substituted with Six Flags or Universal Studios, and Disney clearly has a "monopoly" on Disney-branded parks. I believe that was OP's point. Another commenter has already explained how Major League Baseball is literally a federally granted monopoly.