Generally speaking, the institutional limited partners (LPs; pension funds, endowments, family offices, etc.) that invest in venture and private equity incur pretty significant costs to get third-party information about actual performance by managers (i.e. VCs). From largest to smallest, LPs might generally: subscribe to Cambridge's data and use it in-house with full time staff, or hire a consultant (like Cambridge) to assess and help select their managers, or pay a fund-of-funds a fee (on the order of 1%) to do likewise.

The point of all that is: figuring out who is actually making money in VC, and guessing who is likely to continue doing so, is very non-trivial. It can't be done with publicly available, Crunchbase / Angel.co type data, much less a VC's own statements or portfolio listing page.