One of the things we did at PayPal was collaborative filtering and machine learning: looking at patterns of human behavior. We used it there to predict when people would try to cheat the system to get money. But you can predict pretty much any behavior with a certain amount of accuracy.

As CEO, I believe my most important job is to both define reality and inspire hope for the PayPal team. Defining reality includes being realistic about all the things that could go wrong so that we are prepared to navigate those challenges.

For merchants, it is an amazing opportunity. Compared to Paypal, crypto has no credit card fees, no charge backs, no 'Oops, we decided to hold your cash for 3-12 months while we investigate something we can't disclose.'