Maybe. But if you're holding a LOT of crypto, it's very unwise to store the private keys on an internet-connected computer you also use for instant messaging and other things.
(I'm sure plenty of people do actually do that; just lamenting the fact rather than expressing skepticism at the plausibility.)
I left like $80 worth of crypto on a computer that my nephew was using for gaming online, and only remembered when I realized that it had grown to be worth over $1000
Fortunately I recovered it before any of the virus-riddled crapware he downloaded noticed it was there, haha
(I'm sure plenty of people do actually do that; just lamenting the fact rather than expressing skepticism at the plausibility.)