you are WRONG. market capitalization for altcoins doesn't show anything at all. people mistakenly use it to compare coins with each other and rank them but it is WRONG nonetheless.
market capitalization is only used for companies because their shares are meaningful and they can not have unreasonable (fake) number of shares in the market. but an altcoin can have unlimited (fake) number of circulating coins in the market and that easily increases its market cap.

for example a shitcoin worth 1 cent can have a bigger market cap than bitcoin if it has a couple of hundred billion coins in circulation. and it is easy to create that much. there are already 200 coins with that much coins in circulation anyways!