That logic doesn't follow, because we know DMM does have, at the very least, expiration on their points system, the same way Nutaku has on their gold system. And Nutaku is officially recognized as English DMM.
We also know that Nutaku Aigis is run by the same devs as DMM Aigis, unlike Nutaku/DMM FKG.
In other words, you can't fault Nutaku for having/not removing something that DMM also does.