You don't own the art with an NFT purchase. You own the receipt saying you bought the art. The receipt lives in the mythical blockchain, and as long as it's agreed on as valid it has value (whatever that value actually IS is debatable). But there's literally nothing tangible, and anyone can right-click-save-as on the art and do whatever they want with it.
I wish I got in on this scam a long time ago so I could retire off the gullible hype beasts.
You don’t own the art with a physical purchase either. You have a reproduction of the artist’s idea, in a medium he chose, possibly made by themself, possibly not, and you can hang it on your wall, but the artist retains the copyrights and they can make as many copies just like it as they please and keep selling them.
You can argue that no two brush strokes are truly the same, and I can agree in principle, but then we are once again limiting the whole conversation to paintings again. No one is selling paintings as NFTs (at least in the scope of what we are talking about here).
If it’s too much of a stretch to label as art the pictures that the influencers are shilling, you can think of them as trading cards. You can go into a store and buy a pack of Pokemon cards, and each card in the pack cost you the same upon purchase, but the market places a different value on some of them based on rarity or some other aspects. This rarity is completely manufactured, they all come from the same factory and they could make as many as they want.
And sure, the Pokemon cards are still physical objects, but the object itself is a cheap piece of paper and there is nothing intrinsically different between the cheap card and the expensive card. And if you just like looking at them, you can take a photo or scan it and print your own. You can find them all online and print a whole set. Or if you just want to play with them you can write the stats on pieces of paper and use them instead.
Only when you want to trade them does it matter if you hold the real card or a selfmade one. And thats the deal with NFTs, sure you can take a screenshot and do with it what you will, but if you want to trade it you need the real thing. And whether or not the NFT you hold has value for other people is decided on the market. But if someone is saying that you should invest in this image of an early 2000s message board avatar because they
will raise in value, then yeah that would be a bit scammy.