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xkcd #3109: Dehumidifier
(imgs.xkcd.com)
Title text:
It's important for devices to have internet connectivity so the manufacturer can patch remote exploits.
Transcript:
[A store salesman, Hairy, is showing Cueball a dehumidifier, with a "SALE" label on it. Several other unidentified devices, possibly other dehumidifier models, are shown in the store as well.]
Salesman: This dehumidifier model features built-in WiFi for remote updates.
Cueball: Great! That will be really useful if they discover a new kind of water.
Source: https://xkcd.com/3109/
That's the feature they sell. But, its real purpose is to monetize your data and/or lock you into some sort of ridiculous subscription service and/or run ads.
That's pretty much ubiquitous for "smart" devices.