Vlad Tenev on Robinhood's Covid-era "bulk and cut": “When we went through Covid, there was a lot of pressure — not just from what other companies were doing, but also just because we were doing very well during Covid and growing very quickly." "We went from, I’d say, end of 2019 we had 700 people... to in the next year, end of 2020, we had thousands of people and close to a billion in revenue.” “I think we continued that hiring and became a big company very quickly. Things didn’t really work…