FTX Hacker in BTC Mode 

     The hacker(s) who stole over $477 million worth of cryptocurrencies from the bankrupt exchange FTX are currently converting the stolen assets into bitcoin using a long procedure. However, I do not think that this is the work of any hacker. 

Input Crypto - Process Altcoins - Output Bitcoin 

     The hacker is slowly converting crypto to $ETH, then dumping ETH for Ren protocol bitcoin $RenBTC, then converting RenBTC to bitcoin through a pool. 

Well Planned Strategy 

     Since no centralised platform will allow this, there is instead the possibility of freezing the hacked assets instead. That's why the hacker is doing all the work on the on-chain decentralised platforms.

Thoughts

     Smart Hacker, or say FTX team knows that Bitcoin is king, they are deliberately going for Bitcoin. SBF has long arms, media, politics, authorities made a hero out of him.