Either selling shovels (https://micky.com.au/bitmain-earned-300-million-in-profit-for-1q20-reports-say/ https://micky.com.au/bitmain-earned-300-million-in-profi

Either selling shovels (https://micky.com.au/bitmain-earned-300-million-in-profit-for-1q20-reports-say/ https://micky.com.au/bitmain-earned-300-million-in-profit-fo...) or making a market for people to trade in (https://www.coindesk.com/binance-to-earn-profits-between-800m-to-1b-says-ceo-changpeng-zhao https://www.coindesk.com/binance-to-earn-profits-between-800...)