These are just generic Android TV devices that use Allwinner board. Allwinner made these kind of generic boards for Android TV and Android Auto head unit and sell them to OEMs. The OEMs then "customize" it by adding their APKs into the ROM provided by Allwinner. I doubt the malware come from Allwinner. Maybe it's just one (or more) OEM that include whatever APK they found on the internet without checking.