The problem is a lack of respect for the consumer. The manufacturers don’t act as if the computer belongs to you. They act as if it is a billboard for restricted trial versions of software and ads for Web sites and services that they can sell to third-party companies who want you to buy these products.
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That's some marketers for you. Show them anything without an advert on it, and they think "Hmmm, we really should put an advert there."