Looking through his transaction history he's used 60 gwei for every transaction, except this one.... That indicates the wallet was previously controlled by a smart contract or some automated service, but then this guy took over and manually cranked to gas price up to 500 million.
What's more likely is that he is working in cahoots with the mining pool to forcibly move money from one place to another, potentially converting illegitimate gains into legal proceeds (mining revenue). He'd then split the difference with the pool owner and get away with essentially laundering money.
This isn't the first time Sparkpool has received suspiciously high fee transactions before. And they often seem to agree to split it back with the sender.... Why would they do that when it's rightfully theirs to keep?
The question is how fees on ETH network will be used after all. You made a point that it is a suspicious transaction (maybe well planned) to create FUDs, to do money laundering. The vital thing is if the sender has plan to get his fees back (with a deal to fee receiver, something like that), the person will not lose anything with that transaction.