Are Android boxes illegal?
Absolutely not! There’s nothing inherently illegal with an Android box. It is simply a streaming device running the pure Android TV operating system.
That said, there are some apps or streaming sites that could be illegal to use, depending on your country’s laws and regulations. However those same apps and streaming sites would also be illegal to use on your smartphone and tablets.
Do you need internet for an Android box?
For the most part yes but not totally necessarily. You can play video files from your local network, external hard drive, or flash drive without needing an internet connection. However if you want to stream content from sources like Netflix, Disney Plus, Amazon Prime or other streaming sites, you will need to be connected to the internet to do so.