Well the biggest draw of Infinia is the massive rewards that come from using it on Smartbuy. And a bulk of Smartbuy purchases are Amazon Pay GVs. Which are primarily used to pay insurance premiums and other bills. With that becoming useless what else is Infinia's strong point? I don't see any other voucher being used on a daily basis. Infinia is terrible when it comes to redemption options.
Infinia without Smartbuy's accelerated rewards is just Magnus with a lower spend limit.