- consensus
- distributed computation
- statefulness
- peer to peer identity
- peer to peer reputation of nodes
- resistance against many classic failure modes (e.g. Sybil attacks)
- peer to peer source of truth (e.g. Namecoin/DNScoin)
- verifiable code execution (smart contracts)
- immutability/ tamper proof
- and (obviously) peer to peer payments
Granted, some of these overlap with each other, but the point still stands. The pearl clutching over cryptocurrency seems extremely inauthentic when you consider the vast sums of energy tech giants expend to target us with ads.