It’s saying that you can use Bear for your own blog, but you can’t launch a service that hosts other people’s blogs using it.
"Bear Blog has been built as a platform and not as an individual blog generator. It is more like Substack than Hugo. Due to this it isn't possible to individually self-host a Bear Blog."
"It isn't possible" is obviously not true but a plain reading of both that combined with the license would suggest you can't use bear at all for anything.
Where does it say that?