For each and everything it is possible to see an alternate. As a result altcoins were developed. Altcoins are the competing power to the bitcoin. If there is only one service provider people find it bored after some time period. When there is competence, each will compete to provide the best. This is how altcoins function. There are scam coins and for the same we should not indicate everything together as a scam. Invest on the one you find trusted and leave the rest.