Market caps aren't everything, because, let's say I mint a new token and there's 10 trillion supply of this new token. If I sell 1 for $1, that implies a $10T market cap, doesn't it?
So Bitcoin SV is a fork of BTC (or BCH, can't remember), and what that means is a large part of the supply is untapped, because most BTCers (or BCHers) haven't even interacted with the chain. Their BTC (or BCH) balance is still there in the fork, based on whatever they held in their wallets prior to the fork. But maybe they don't even know the esoteric fork exists. So a large part of the supply is locked up due to ignorance alone, or due to relative lack of liquidity on exchanges.
At any rate, if you really want to know what people are using, when it comes to crypto, look at how much they're spending to use the chain or application: http://cryptofees.info/
Market caps get extra weird for cryptocurrencies which are created as forks of an existing chain, because everyone who held the original coin at the time of the fork technically holds an equal number of the forked coins, even if the owners of those coins have never interacted with the fork.
