Is this card worthwhile to someone who doesn't pay rent?
Yes. Even if you don't pay rent or HOA dues, you can still earn 2x on the first of the month, and there are sometimes bonuses with certain merchants. Transfer partners are respectable.
The only potential downside is there is some talk of the Bilt model being unsustainable, so if they reduce the benefits significantly or shut down completely then perhaps it would have made sense to save the new account or hard credit pulls for a different card.