This is what I could never understand completely. If most altcoins have fake market caps (some people are saying that you can assign just any market cap to your shitcoin), then why the coins from top 20, such as BTC, ETH, BCH, LTC, XRP, DASH and XMR, constitute over 80% of the total crypto market cap, while all the others, 2,100+ alts, add up to less than 20%?
I'm not trying to say, you are wrong. It's just the whole thing seems pretty strange to me.
It's because of Coinmarketcap gets rid of them. You refer to +2100 alts, but there are over 10,000 in reality. 2100 is only what Coinmarketcap allows you to see.
I'm not exactly sure what the name of the coin was, but one coin ended up seeing its market cap surpass $2000 billion, but with a volume of $30,000 in the last 24 hours. Coinmarketcap delisted it from their platform because of how obvious the manipulation was. Right now if you haven't got x amount of volume to justify a certain market cap, they will delist you.
Projects have gotten more cautious because being delisted from Coinmarketcap very likely means the end of your project.