Their core issue, I guess is that CMC provides ticker data, not trade data. Some of their more advanced competitors like Coin.Market already provide such data (trades data), so you can calculate how much volume was for 1 second, 1 minute, or 1 hour and so on - you can also check how many trades were to get, for example, btc/usd in a selected price range on all exchanges or on one exchange - that provides much better protection from such fake data for users.
How does that protect from
fake data? I'm not sure I understand this distinction between "ticker" and "trade" data. The volume data coming from exchanges and the coin supplies themselves are the problem. Any service like CMC needs to figure out a way to filter that data.
Litecoin will be hit much harder due to the insane fake volumes it has been generating for a long time now. BSV is doing much better on that front and may even rise above Bcash and Litecoin.
How do you know most of Litecoin's volume is fake and most of BSV's volume is real? BSV is mostly listed on lesser known exchanges with suspicious volume numbers.