My hunch is it is basically Android TV on a cheap Chinese box with a skinned Kodi and a bunch of plugins installed (such as Exodus and SALT)..
This is sort of my wheelhouse. Bit of a pirate and media guy here.
For fun I decided to try and play a movie in Kodi using one of the pirate sources. SALT for this example. In the end I just give up and switch to my plex server.
As these “Kodi” boxes become more popular it becomes harder and harder to stream. These are just random people pirating shit and then publishing their servers. Demand has donkey-punched supply. This actually used to work pretty good. But once you could install Kodi on the Fire TV everyone started buying one with all the piracy shit pre-installed. A victim of its own success I guess.
My experience with Kodi 30 minutes ago. https://www.youtube.com/watch?v=p736mgevTLk&feature=youtu.be