GitLab does not provide sub domain for their pages service?

I wanted to set up a page at GitLab. I thought it'll be something similar like GitHub's, where they provide you a sub domain under the GitHub domain. However, as I'm reading the documentation and checking the settings page of the project, I've started to realise I need to have my own domain registration, and GitLab "just" sort of provides a hosting service for that domain.

My question is: am I seeing this right, or is there something I'm missing?

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