What engine does Duolingo use

Does Duolingo use Komodo for its engine?

I play chess on Duolingo sometimes too and Oscar is the chess teacher and the engine you play against. I’ve noticed though that the 700 elo Oscar plays like a 700 elo komodo bot (Bots are much worse than humans, I can estimate Sven at 480 elo) except Oscar will blunder queens for absolutely no reason. One time I did an experiment by hanging my queen for no reason, he took it, and he still blunders every other piece so I can rook my pawn and checkmate him.

What sort of engine does the Oscar adaptive bot use that would be so bad? Sometimes I blunder because I forget a fork exists or I am impulsive but Oscar is so bad, I need to know what engine Duolingo uses. If Duolingo used AI slop neural networks though and only Ai slop neural networks I would not be surprised 

Google says it’s ai… but idk

When Oscar used the 700 rated engine Oscar voluntarily gave away a free queen. Janjay has never done anything like that so Oscar’s AI is clearly different

I'm very confident they don't. Chess.com owns Komodo and wouldn't license it to a competitor.

How do I find this engine so I can beat Oscar without a queen and also make Oscar vs Jimmy or something