To mess with Marx
Pretty sure they're still the "top holder of BTC" with assumed ~5% of the total possible amount. There was a discernible pattern to the proof of works in the very earliest blocks that seemed to indicate which ones were probably the inventors, with the most likely explanation being they were using institutional grid computing, which they probably had some quota available to use.
Would be cool if they could somehow unload it all and crash the price to 5$ or something one day, but unfortunately it would take so long to move and the public nature of the ledger would tip everyone off well in advance probably.