People want the features that these things drive. PCs stopped being a purely "user says X, do X" thing at approximately the moment they became powerful enough to run things in the background. The idea that the computer would be helpful and do things for you beyond what you explicitly asked for is pretty attractive. People don't like being spied on, but good news, this one is all local. This isn't like Facebook building a social graph for you so they can sell the data to advertisers.