They just fixed this. They raised the price of the kids version, ads turn back on if you turn kids mode off.
You can sideload on to any kindle.
Paperwhite (non-SE) is the version to go for. They go on sale every month or two, check camelcamelcamel.
https://singlelogin.re/
https://calibre-ebook.com/
Have fun.
brantes
joined 1 year ago