[Traster]

I'm not really sure this guy ever actually lost £400k. The 10 BTC are from when he bought in 2017 (for £40k and he'd cashed out that original investment already) and I don't see any plausible reason someone like this was actually planning to cash out at the current price. It's not like the £400k was money he had earned and plowed into BTC.

In many ways this is a facet of being an investor in BTC and should be a message to any BTC investor sitting on top of what has become an astronomical sum- take a look at your portfolio. Take a look at all the risks of being invested in a single product like BTC (scam risk, risk of hack, risk of adverse regulations, extreme volatilty, perfect correlation of your entire investment portfolio), take a look at how much of your portfolio is invested in that single asset, and decide whether you should rebalance. Because no offence, if your savings are 90% BTC, you're not investing, you're gambling on BTC.