Users decide what the purpose of a blockchain is, simply because the blockchains that gain the most market share are chosen by users. Users follow developers that provide quality services, and developers pick the chain that meets their application needs closest.

Of course it’s great when people experiment on their own hobbies, I’m guilty of that pleasure myself all too often! Just please don’t use it as an excuse to attack people doing something different from you, as we see the btc and eth communities doing sadly too often.