Doesnt have to be in the form of an APP to be a legitimate block-chain based product. An Ethereum based token operating on the blockchain can be used for example for purchasing cloud computing or AI based computing, examples include iexec and AGI singularity net. You can actually buy cloud compute with those cryptos, for example if you want a render done instead of paying in dollars you pay with their tokens, its faster, its digital, no central bank required, you can buy the tokens early as in today, and have them become more valuble over time thus you are holding something of value, tokens that buy compute resources that are going to be more valuable in the future ( you speculate).