NFTs can be marked as fake, spam or as inappropriate when the NFT contract has been flagged.
NFTs that are flagged can not be sold on the market, but we still allow you to transfer them.

The usual reasons why an NFT is flagged are:
NFTs that violate copyright rules
NFTs that are used to spam
NFTs that are used to push advertisements
NFTs that are fake and are used for to scam people.

NFTs coming from a general minter contract such as the public minter of Polygon can also get blocked if that contract leads to many scam and/or fake nfts
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