One plausible explanation... YC needs to be notified when portfolio companies take on new funding, upon which they will receive access to valuation and financin

One plausible explanation... YC needs to be notified when portfolio companies take on new funding, upon which they will receive access to valuation and financing information (eg. so they can exercise any pro rata rights). They don't need to go out of their way to request this information, nor do they need to unduly burden their portfolio. For job and revenue information, they would need to directly reach out to portfolio companies and ask them to self-report. I'm sure most would... but it's not exactly passive.