Games, collectibles, lending, money markets, exclusive virtual clubs, international payments, trading are just a selection of activities I’ve personally engaged in on chain in ways I could not have off chain.

Also whether or not you like speculation, many people do and it’s not a crime.

Having something you can transact with and store value that isn't completely vulnerable to your government's monetary and foreign policy/capital controls

Buying drugs from the internet. Or are the kids not doing that anymore?