Anyone can create coin or a token with as high marketcap as they want. Trick is is there's no significant liquidity. Or when you own all the tokens or even 99.999999...% of them as the supply is insane it's pretty easy to just set sell orders too high making the marketcap what ever you want. It's just not going to get ranked by any serious marketcap listing service.

Their target group is idiots, as it's easy to confuse idiots as they don't understand how anything works. And it's a huge market when there are a lot of idiots and ignorant people out there.