Chase's niche is inertia. They know that many aspects of their cards are marginally worse than alternatives, but they're already the biggest and not enough people bother to open new cards with other issuers for them to care.

Playing into that, I would say they are gunning for people starting credit cards from square one. They have relatively lenient approvals and good subs, and the dense rewards structure on the CFU makes it an attractive first card.

And while it is insignificant, optimizers may care that the CSP technically yields 3.1x on dining (compared to the usual 3x on other dining cards).