In particular it's the short term stock price. They'll happily grift their way to overinflated stock prices today even though at some point their incestuous money shuffle game will end and the stocks will crash and a bunch of people who aren't insider trading are going to be left with massive losses.
Stock price increases that don't lead to higher dividends eventually are indistinguishable from Ponzi schemes after the fact.
Buybacks lead to stock price increases and are indistinguishable from dividends in theory, and in practice they are better than dividends because of taxation.
The problem I have with that logic is that it still doesn't really give any sensible reason for why the stock should have any economic value at all. If the point is that the company will pay for it at some point, it makes more sense for it to be a loan rather than a unit of stock. I stand by my claim that selling a non-physical item that does nothing other than hopefully get bought again later for more than you sold it for is indistinguishable from a scam.