After registration, I have never connected my Kindle to the internet - 6-7 years now. This has prevented updates that degrade performance, and Amazon getting my

After registration, I have never connected my Kindle to the internet - 6-7 years now. This has prevented updates that degrade performance, and Amazon getting my usage data. I just copy over ebooks using usb, optionally after converting to mobi using Calibre. Works perfectly.