All in all they have nothing to do with Facebook Meta and are simply standalone "games" which try to profit from the hype?
Isn't metaverse simply used here in the context of "sandbox game" or "open world"?
Its Mr. Zuck who is trying to profit from the hype, not the other way round. Metaverse as a concept is about owning digital goods with blockchain linked identities and interacting in a virtual environment using avatars. Beyond that there hasn't been much development as far as decentraland and sanbox are concerned. They are just blockchain versions of games like Second Life or even minecraft.
The "Metaverse", for the time being, is really just a farce.
But honestly Second Life delivered much more and is already 20years old.