Is this uncommon? E.g. I don't have any inside information as to what went on with the Coinbase acquisition of Earn.com, but from an outsider perspective it certainly looks like:
1) A16Z invests tens of millions of dollars in Earn.com, which fails.
2) A16Z has their other portfolio company Coinbase buy Earn.com to shift some of their profits from Coinbase back into their earlier fund. (Which as far as I can tell is not only completely useless to Coinbase, but is also a huge legal liability.)
3) A16Z uses the "success" of their fund with Earn.com to raise more money.
4) A16Z then compensates Coinbase by investing in them at a higher paper valuation.
I could easily be 100% off base so I don't want to libel anyone, all I'm saying is that that's just what it looks like as someone who wasn't privy to the actual details.