You can rest assured that I appropriately warned him. I personally took the Luna/UST situation to talk to him about fake APYs, risks, and why anyone offering more than the risk-free rate (~3% US Bonds) is making some kind of risk (just as the laws of physics prove that perpetual motion doesn't exist, the laws of finance prove that risk-free rates _above_ the risk free rate are non-existent).
In any case, Celsius has managed to convince a lot of people that their 10% or 20% APY stablecoins and "staking platform" was risk free. Sometimes, these people need to have their own money burned, before they believe in the potential of risk.
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I don't know anything about internet celebrity figures. But I do know a thing or two about risk-free rates and reasonable return rates.