It's not useless as such, although certainly its use is exceedingly niche. My headcanon is that Cecil Rhodes saw something back in the 1880s, something which drove him to create a corporate engine which would continue to bend the culture centuries after his own death. Now, a hundred and fifty years later, an appreciable fraction of the population carries with them at all times an object capable of scratching everything. What he saw, I cannot say, but one day in our hour of need the population will be equipped.

bitcoin is the 21 century's diamond. Same useless string of cryptographically signed bytes, but for some reason the humanity agrees to assign some value just because of scarcity mindset.

At least diamonds are shiny and you don’t have to pay miners literally forever

Bitcoin has its value due to anonymity and global footprint.

I can ransom hospitals with cyber attacks and get paid millions sitting on North Korea/rusia/Iran and dont have to stand up from my desk.

I can run distributed anonymized illicit drug distribution risk free and get paid a lot.

I can hire hitmen to gather intel and harm my adversaries and arrange kinetic campaigns.

A lot of good use cases.

Haven't you heard about goldbugs?