Anyone can make up coins but why is anyone even buying any of these? If dogecoin has no real use... then none of those other coins have any use. So why do these new coins keep showing up?
the main reason for all that is money. everyone wants to get rich quick and some people try to profit from all that by creating new coins/tokens. so there will always be new cryptos released by looking at the existing ones. what everyone looks at when buying is not about utility or use cases, but hype. everyone is aware that new coins are shitcoins, but they will keep buying because of the hype.