Are their any programs out there that are good for bus travel?

I guess you can get 5%-ish back on travel from a few cards, I think there are some weird Amtrak buses so maybe the Amtrak card for that. I guess maybe there are app-specific discounts but I don't think there are loyalty programs anymore for FlixBus/Greyhound.

But i'm guessing maybe there are portals with good redemption value for bus travel?

Any big threads on here discussing that?