During the crash, was there a stop-loss for NFT? NO! Because that market is not like the cryptocurrency market, or the stock market/commodity market where LIQUIDITY can protect you from big losses. A price of a $1,000,000 NFT can crash to $10,000 during an economic depression.
There is no swap or exchange for NFT that puts in that type of situation, which is why there is no stop-loss. It is an asset and not a currency, there will be 21 million bitcoins, all are the same bitcoin, does the same thing, it is just one bitcoin. NFT's are all different, all worth differently, you can't have a market like that for a stop loss.
You decide on the value, the buyer and the seller decides it, and for each single individual one as well. What can you do? You can always put it for sale for a million dollars, and one day if it actually worths that then it will be bought, but that is for going up, for going down if you put it on sale for cheap then it will be sold right away and you will lose. You need to be constantly active and constantly checking the prices to decide how much it worths at that point, which many won't do.