A better question would be, did anyone ever even buy them to begin with?
This means that 79% of all NFT collections – otherwise known as almost 4 out of every 5 – have remained unsold.
That is, most of the NFTs included in the OP statistic were listed for sale by their creators, and never recorded a sale. Another important detail is that even for the ones that did record sales, there's no real way of knowing if those sales were real. You can easily make another crypto wallet and buy an NFT from yourself. For more elaborate wash trading, you can find someone with an established wallet to collude with. There are obvious reasons to do this too; building up a history of increasing sale prices could potentially dupe someone into thinking an NFT is a good investment, or you could launder money by selling an NFT to a 'dirty' wallet you also control.
Probably some portion of the market was "real", but the volume is almost certainly much lower than anyone is reporting. Statistics like what the OP article is quoting are just about totally meaningless.
I knew people (well one person; in my developer meetup group) that went deep on the NTF craze, like has an spe avatar unironically, spent a bunch on NFTs, and if they're telling the truth made bank off of them.
It's pretty disappointing. I wonder whose money they took.
Again, probably some of it is real, and that's the segment people who made money dealt with. I think of it as a sort of gambling; your acquaintance won a gambling game, someone else lost. Possibly there were some overly wealthy people buying them for status, or maybe that's just a myth. But the point is, most NFTs themselves aren't part of that at all, were never a part of any real market, so doing analysis on them is going to be misleading.
Hundreds of millions collectively, when people were dumb enough to buy them. The problem is that eventually dumb people ran out of money and the worth plummeted to zero.