There are legal definitions of negligence. IANAL, but I'd imagine that what you're describing would meet those definitions.
Investment decisions aren't as easy to diagnose because there's a chance of upside. If FTX didn't end up as a scam, you stand to gain a LOT of money. The same can't be said of putting your only copy of a movie on a crappy SD card.
In addition, you could make the argument that the chances of FTX being a scam were priced in. That is, you're buying stock that accounts for the scam chances.