Doesn't really seem that scandalous to let them be grandfathered in.
They have legitimately been selling the same product that whole time. (Except 1985!)
Are they the only one that was grandfathered in? Or are they simply the last surviving one?
I don't know, but I mean, it's been over a century. Even if there were others, I wouldn't expect them to still be around.
@apLundell what's messed up is they're the *only* ones allowed to do that iirc.