Who is the Bitcoinbillionaire? We messaged the account to ask for more details, and have not received an answer at the time of writing (we’re not sure we expect one either, the account is clearly a throwaway and they undoubtedly got a lot of messages).
There are snippets of information: he or she claims that they were an “early adopter”, and had forgotten they even had any Bitcoins. “I am bitcoin,” he or she wrote in a moment of megalomania.