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Apple is much more of a monopoly than the ISPs in my local areaThe courts disagree. ISPs can be treated as public utilities by states, if they so choose. (New York's Public Service Commission just kicked an ISP out of the state [1].)
In any case, we are talking about specific products. Internet service with respect to ISPs; podcasting with respect to Apple. Apple does not have anything resembling a monopoly in podcasting.
[1] http://www.wktv.com/content/news/New-York-PSC-orders-Charter...