What is George Mack's test for real product-market fit?

George Mack said true product-market fit means customers would keep buying even if you insulted them. He drew it from time with James, the founder of drink-mix brand Element, and from Apple's iOS privacy change, when advertisers called Apple a monopoly abusing its power, yet he did not see a single one give up an iPhone.

Shaan Puri added that Warren Buffett's Apple stake, his best investment, rested on how hard it is to get iPhone users to switch.
Puri said Buffett bought into American Express after its salad oil fraud scandal by asking shoppers and cashiers whether they still trusted the card.
Chris Williamson compared it to a social bank account that lets some public figures survive scandal after scandal.

▸In their words

“I didn't see one give up their iPhone.” George Mack · at 2:02:50 — open in the transcript →

Source: our own transcription of the episode. The full conversation is on Modern Wisdom (2026-10-26). Read the whole episode summary →

▸More from this episode

Q1How did Shaan Puri's bettor friend make 1% a day on Polymarket?Q2What do Jack Butcher and George Mack mean by taste and slop?Q3Who is Nigel Richards, the Scrabble champion discussed on Modern Wisdom?Q4How did Sidney Frank create Grey Goose, according to Shaan Puri?Q5What did Shaan Puri say about near-death experiences and seeing your life flash?Q7Why does Chris Williamson think being a moderate Democrat is becoming cool?Q8Does Chris Williamson think AI makes students learn less?

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