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John Gruber:

I worry that it’s toxic to combine advertising sales with an exclusive app for playback. Advertisers want tracking? You got it — in Stitcher. The end goal here is lock-in, and so I think it’s worth fighting right from the start, even at the expense of a few thousand additional listeners for my show. Maybe they’ll never become dominant. Maybe even if they do, they won’t do anything to promote lock-in. But now is the only time to resist the possibility that they’ll grow dominant and abuse their position. It’s too late once it happens.

I’m not as worried with services that re-host files — like Google Play — as Gruber is, but I agree that locking advertising to a select platform is bad for the industry.