Looks like the culprit is a dedicated (stolen) BTC hodler, probably waiting for bitcoin to reach the moon.

Jokes aside, have you ever tried to "sweep" it to another wallet?
Because that's one way that it could be sent to another address which belongs to the wallet where you perform sweep.

BTW, Bitcoin is non-custodial and decentralized - your funds is in your control and there's no central authority that manages bitcoins.
So, even the developers can't refund your bitcoins.