The killer app is decentralized, permissionless, open source, and censorship resistant network.
Bitcoin's narrative has had to morph from "digital currency" to "digital gold".
Gold morphed from worthless rocks in the the ground, to coins traded by traveling merchants, to stores of value that were eventually centralized and monopolized by governments.
RE: Tether I don't trust them either, but we need more evidence of this alleged printing. We saw that they did remove the 1:1 peg briefly when Crypto Capital in Panama (?) froze a few hundred million of their USD.
Bitcoin now finds itself a high tech manifestation of the very thing that Satoshi sought to address.
Bitcoin is sound. The centralized exchange layer built on top of it is dirty.