Yes, this is the case. Quoting myself from another comment:

> On a blockchain, once I've deployed my app, I can walk away and never think about the app again. I only have to pay for the initial deployment of the contract without any further ongoing cost. The app will always be there ready to be used by an end user who's willing to pay to interact with it.

As long as someone continues to pay for the storage of your app, which is not guaranteed.

Presumably the app also has other assets like js and frontend that need to be hosted. These aren't just compiled and stuffed in The Blockchain until the end of time.

Only the compiled contract itself.

Right?

I don't know, but even if everything is stored on a blockchain, the blockchain itself needs to be stored somewhere, and storing data has a cost. So someone has to pay for that (which typically is the users of the blockchain with their fees).