PayPal ([[PYPL]] +1.4%) continues to build up its cryptocurrency services for users, but for the time being, it's not interested in investing in those digital assets, Chief Financial Officer John Rainey told the Wall Street Journal."It is still a highly volatile asset right now," Rainey told the newspaper. "But if in a couple of years, there is more stability, I would never say no."The company sees the push into cryptocurrency services as a lucrative opportunity, as its crypto users are highly engaged. "About half of our crypto users open their app every single day," said PayPal CEO Dan Schulman during the company's Q1 earnings call.The payment fintech recently launched the ability of Venmo customers to buy, sell, and hold cryptocurrencies. Schulman said a survey shows that ~74% of Millennials expect they'll use crypto in the next year or two "in some way."Furthermore, the company has been talking with regulatory bodies "and