Huge legal and regulatory issues either way. Imagine if one of the big gold sellers allowed you to trade in your gold for an IOU, or directly exchange dollars for the IOU. Then society starts using these as bearer instruments, de facto money. In the United States at least, this wouldn't go over well, as the government has a monopoly on currency. In the case of the gold company, and in the case of a fedimint, the government shuts it down, because both are centralized.

An issue with the lingo from a psychological perspective is that bitcoiners don't want to part with their sats for "points". If it isn't denominated the same, I don't think it will fly. Also, have you noticed how airlines and credit card companies "re-value" their points?