Is it not a little ironic that this payout is in bitcoin, that has been repeatedly shown to be the furthest thing from anonymous? Would they not be better off exchanging it for a coin with baked in anonymity?
Wasabi Wallet has built in trustless coinjoins, routed through tor by default: https://wasabiwallet.io/
Samourai Wallet has similar features, requiring a much smaller amount of coins: https://samouraiwallet.com/
I assume anyone competent enough to hang on to this amount of bitcoin is already doing this.