Moments is about lowering the bar to new users of Twitter (the discovery problem) and get existing users more engaged in sharing content so Twitter is more valuable to them.
For those users, celebrities and sports is exactly what's going to draw them in. Twitter can then sell ads against those users.
I'd be surprised if it had any kind of algorithmic targeting any time soon, or if enterprise tech firms were looking to get involved in producing native Moments content in any serious numbers.
Then they made it an option to not get these, then they took away that option and made it mandatory.
This, plus their really terrible behavior towards developers (still going on, as evidenced by their continuance of the 100K tokens limit per app) has seen me basicly stop using the service entirely.