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The problem is that hypothetical park is public land, maintained by the government at least partly with tax dollars for the benefit of the citizenry.
Those Yahoo servers are owned, operated, and paid for by Yahoo.
One of the most long-standing principles of The Internet is that you can generally do whatever you want on your own network. A recent example of this was a court case (in Texas?) where a spammer sued a university for blocking emails the spammer had sent to students. The court ruled that it was OK for the university to do that. I'm as much of a first amendment partisan as the next guy, but I wouldn't be thrilled if it suddenly became illegal for my employer to operate a spam blocker.
(The role of actual ISPs as common carriers--or not--is admittedly somewhat murkier, but that's another discussion I don't have time to wade into right now.)
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