This is such a weird take. When choosing what to buy, it’s impossible to factor in whether or not you believe the seller is already too rich. How could such a market ever determine the price of goods?

No, free markets work reasonably well. What doesn’t work is extremely disproportionate wealth, which is a result of neoliberal policies from the 80s. Revert those policies (i.e., actually tax the wealthy), and get back to medium healthy economy of the 60s and 70s.