I am wondering how someone can have high amount of coins that is worth millions of dollars and holding it on a hot wallet comfortably and sleeping easily every night. I can not have that amount of money on a hot wallet and be sleeping easily until I get myself a hardware wallet.
Pretty easy!
Take your whole net worth, let's assume you have $1 million, just for the sake of conversation not insinuating anything, divide it by 5000 and now tell me, do you feel like you couldn't sleep over $200 of coins left in metamask? There are people who buy cars worth nearly that much as those coisn are worth and never drive them more than once forgetting even at which home that thing is, and here you have a guy with 5 billion worth of assets who bought on impulse some coins and tossed them in some wallet.
But on the other hand, I saw him once saying that he was taking advantage of Amazon offers to buy in bulk, consumer goods that he uses all the time and things like toothpaste. Although it may seem silly, people who have become that rich starting from the bottom tend to keep the habits that have made them rich once they are at the top.
For some it's a bit more complicated, it's not that they have to save every penny or that they have some sort of trauma but they don't like it if they feel cheated or misled on buying something, they will argue for one hour over $5 wrong in a bank statement but they wouldn't care throwing away 1million in a day. Not really being cheap, more like trying to play it smart or something!
My bet is on some custodial service like Coinbase or Bitgo!