In particular, the Voyager home page says that "USD" and "cash" deposits are FDIC-insured, while the debit card landing page talks about how you can earn reward

In particular, the Voyager home page says that "USD" and "cash" deposits are FDIC-insured, while the debit card landing page talks about how you can earn rewards while "spend[ing] USD Coin like cash". I can easily imagine a naive consumer coming away from this with the incorrect impression that USD Coin deposits, being equivalent to USD, are insured to the same extent.