Clubhouse can be thought of as the next stage in the evolution of audio. It started with radio (passive consumption of centralized content) followed by podcasts (programmable radio with decentralized content creation) and now Clubhouse (centralized audio-only conversations where anyone can spontaneously be a creator or listener).
A corollary to this evolution is written content. It started with newspapers (centralized content) then evolved to blogs (anyone can publish) finally to Twitter (more accessible and centralized).