Sorry but that is ridiculous. Look at the stock price for Amazon. Anyone who has invested in Amazon has seen an amazing unprecedented ride upward, institutional benefiting the most.
I also take umbrage with the idea that Bezos is running Amazon for "fun" as though it is frivolous. Bezos seems to have a grand vision and that is not something that matches with the ridiculously short term and arguably irresponsible thinking of the vast majority of investors.
We collectively need to get away from the idea that the only valid fiduciary duty for a for-profit organization is to make profit for their shareholders instead of creating value for humanity.[1]
[1] This is refuting the broader point that Benedict Evans is making, and does not necessarily apply to Amazon perfectly.