The pyramid in this case is that the people getting acquisition exits are becoming angels. Not really that different from your example of Sun/Oracle/Yahoo profitability help drive the tech bubble.
Which isn't as scary. Because the outsize rewards are not being paid for by new investment into the sector (unless you count later funding, but that's not the incubator's problem - tech boom and bust is already a fact of life for VCs and other people who invest in later-stage tech companies).
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The pyramid in this case is that the people getting acquisition exits are becoming angels. Not really that different from your example of Sun/Oracle/Yahoo profitability help drive the tech bubble.
That's more like the top feeding the bottom than the other way around.
Which isn't as scary. Because the outsize rewards are not being paid for by new investment into the sector (unless you count later funding, but that's not the incubator's problem - tech boom and bust is already a fact of life for VCs and other people who invest in later-stage tech companies).
Only if you call it a donation instead of an investment.