Holochain is a peer-to-peer architecture — all users run full nodes.

You may be thinking about Holo, which is a hosting platform that runs on top of Holochain to provide virtual Holochain services to users accessing the system via web browsers. In this case, Holo hosts run nodes on behalf of the web users and get paid in a cryptocurrency for doing so. However, “hosts” are not native to Holochain — they are an extension its infrastructure so that Holochain apps can serve mainstream web users.