You phrase it like he made a mistake and lost out on a huge profit but the ROI is exactly the same so really don't understand your comment.
In practice, cashing out billions of dollars worth of stocks is easier than cashing out billions of dollars worth of crypto.
Another option is, now that it's becoming clear to people that Bitcoin is here to stay, you can just borrow against it to spend (avoid taxes, hold on to the upside). Case in point, this person/group borrowed 300M$ with about 1B$ net worth[1].
It's also kind of unclear what the interest is from that page. edit: apparently it's 8.5% https://mkr.tools/governance/stabilityfee
There are also centralized versions with blockfi if you prefer traditional loans.
If it dips below 150% the contract is automatically liquidated. Should give ample time for the creditor to get their money back.
And one more thing, it's not technically an interest rate, it's a stability fee (which btw, gets burned, used to go back to stakers, but they removed that).
This is misleading. The markets definitely move, they just don't show a massive spike in the charts.
Are people just banking on the assumption that it's going to go up higher than how much they have to pay back over time? What if that stops being true 5 years from now somehow, like another coin becomes dominant? Not saying it's likely, I do think Bitcoin will probably still be doing well in 5 years, but I'm not certain of it.
I haven't looked at Coinbase stock liquidity, but I would be it is worse as BTC liquidity.
it's not like the btc must be sold on an exchange