In reply to:

When a product is an integral part of the script, I don't generally find it to be abusive of the passive trust people put in entertainment.



The thing is that the episode of Frasier ran about 5 minutes long (it was the 200th episode), and I'm sure that they'll cut out the entirety of it for syndication. There was absolutely no reference to it in the rest of the program, and any incidental things mentioned were repeated later on. It was solely an ad.
In reply to:

I don't think anyone on here would be complaining if it were Linus Torvalds on Frasier, would they?



No, but there neither is there a mass active dislike of Linus or Linux that they're obviously trying to dispel nor does Linus have a brand new product out for sale for him to promote.
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Bitt Faulk