I would like to say too that I've seen an article and reports before about the data that CMC is showing. They were not been accurate at all and many of them were faked but not by them but the exchanges that are just attached to their API.
If you're looking for legit volume, I think it's best just to use the reputable exchanges like Binance.
It's so annoying to see those maybe CMC should really need to fix that since it could ruin their reputation in future.
It's likely that they have fixed that already but relying on the data that they are showing, I guess you have to find a better source because they've been know to be like. It doesn't matter anymore with their reputation.
They have already built themselves and people just browse on their website and advertisers come to list and advertise themselves there, so they will care or not, they have already established the site.