Yes they are platform coins and could be used mostly on the platform that created them, but I think it's a very good thing as long as this platform are working and creating new things, you are going to continue seeing a growth in the price of this coins even in years to come, but if the project itself become irrelevant in the Crypto space, then automatically the coin become irrelevant and can turn out to becoming shitcoin within a short period of time, let us just make sure we are careful when investing in this companies.