I've been buying the kids versions because in the past, it was the ad-free version and came with a free case, but the new kids version seems to have ads if not used in kid mode:
"Will my kid see ads while using this device? Kindle Paperwhite Kids is automatically set up for your kid to enjoy an ad-free experience. However, if you exit Amazon Kids using a passcode, sponsored screensavers will be displayed on the device's lockscreen."
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