50 million, stolen overnight.
In fact, for 99% of users, there's no need to mess with hot and cold wallets. I, like many veteran investors, have suffered significant losses.
For most people, keeping funds in a few leading exchanges run by Chinese owners is quite safe; at least there have been no issues in the past decade (and they've compensated if there were issues), unless you have particularly large funds.
Bitcoin BTC, Ethereum ETH, Dogecoin, XRP, SOL... as long as the amount isn't too large, there's no need to mess with wallets.