For someone to have done this accidentally and not bothered to double-check, it seems to me they would need to have fat-fingered both the address and the amount. This person is typing with hams.
https://forum.osmosis.zone/t/refund-dydx-user-funds-lost-fro...
Plus that wealth is generating more wealth. Logically, a multi-billionaire wouldn’t care.
You're obviously working under the assumption that the sender is someone for whom one more or one less MUSD makes any kind of difference to his everyday life.