The legal validity of things come from people using it and courts enforcing it, someone years ago might have said:
That’s neat. Until a representation of something on a piece of paper has any legal meaning regarding authenticity, ownership, or anything else, and until the overwhelming majority usage of paper isn’t as a scam, paper remains a pathetic and comically stupid class of speculative asset constituting a pyramid scheme that also happens to destroy the environment.
The thing is that even if a technology is used mostly for stupid things that tells you more about humans than about the technology itself. Or do you also think that phone calls are scams because 90% of the phone calls you receive nowadays are scams, even though the technology behind phone calls is the same used for mobile internet.
Also the destroy the environment claim is really bogus, for starter money pollutes more than crypto when you consider all of the chain of what it takes to produce and transport money. But also for example if you live in the US your home probably pollutes more than a mining farm since they’re usually in places where electricity is extremely cheap, mostly in China near a hydroelectric power plant. But also the technology itself doesn’t need to consume that amount of energy, that’s just the current implementation, but there’s a push to move to PoS instead of PoW, which would mean that NFTs (and crypto in general) would not need farms or even a specially powerful computer.