It's not malware. I've used the M11 for all of 2 hours, and all I did was install 4 apps on it (Netflix, Bandcamp, Hulu, and Amazon Video). I also installed Media Monkey, but it doesn't work because it requires Google Play.
Just to be sure, I did a factory reset, re-installed APK Pure, and reinstalled Netflix, and I still get the "App not compatible" message. It directs me to Netflix's website, which directs me to Google Play, which is obviously useless.
So if you have Netflix installed, don't uninstall it, lest you want it to stop working. And if you are thinking of an M11 for streaming video, don't bother. I haven't tried youtube, but I can't get Netflix, Hulu, or Amazon to work.
Honestly, I think I'm just going to return the M11. I've had it 48 hours and absolutely nothing I've tried doing with it has worked. You can play an album, but a $50 mp3 player can do that. I swore after buying the x5iii that I would never buy another Fiio product, but I stupidly got sucked into the hype. I still can't figure out playlists, and Fiio is zero help because they can't write instructions if their lives depended on it.
How can you release an android device in 2019 with no Google Play support? The M11 is essentially a $500 android that doesn't work as an android, because most apps require Google Play. Fiio should have just made it a pure music player.