You might be thinking of Charlie Lee? Charlie Lee joined Coinbase, wash traded Litecoin [1] to give the appearance of wider interest and volume in order to get Litecoin listed on Coinbase, and promptly dumped all his bags at the peak.
The best part of the story is the fervour that supporters defended his decision to dump his bags, because "it was good for the coin" or something.
Let's admit the true problem of crypto is allowing sociopathic nerds to act as if they will not face consequences.
99.9% haven't
Charlie Lee made all his fortune from selling his Bitcoin and Ethereum the rest is marginal.
His track record regarding the launch, support and development of Litecoin is impeccable and rather unique in the space.
Even half a decade after having no stake in the game he's still dedicating his life to promote and develop Litecoin.