Sign Up Log In. The company is currently exhibiting a similar strategy with the growth of its seller ecosystem, which Ahuja says has become too efficient at attracting merchants. ETFC, He consumes copious cups of coffee, and he loves alliteration. Square does warn that you need to be aware of the risks of trading before you buy and sell stocks. If a user downloads Cash App for easy access to bitcoin trading, for example, they’re twice as likely to also use Cash Card, according to management. Second, Square has developed a strong ability to cross-sell its users on other features of Cash App than what originally brought them into the ecosystem.