High-fee crisis year on Ethereum
Due to highest fee's level records saison on Ethereum that began last year, we saw too many cryptousers trying to find solution to fix their ability to use blockchain and their assets..
Crypto users and Crypto investors
In fact there was on one side people I call "cryptouser" who need to "use" crypto network by performing lots of transactions about lower amounts.
On other side, we find new DEFI farmer and liquidity provider who helped to build hardest decentralized financial system. I often call them "crypto investor" because they bring most of money but because they traded highest amount, they also maked gaz fee's level increase by calling DEFI smart contract with more and more money with highest gaz level to allow them to be sure to submit it succesfully and quickly.
Layer-2 and XDai chain solution
Of course both of them are true blockchain users but this fee crisis maked historical user unable to use tools or to request withdrawing of older contracts (with less money than requested fees to get it back, as I maked on Maker or on Aave). When NFT marketplaces appeared, we saw same problem. That is the reason many platforms as Gitcoin decided to deploy their ERC-721 contract on other chain, as they maked on rewarding NFT contract named Kudos. Indeed, this contract is called on Xdai chain, whereas minted tokens are quickly reedeemed and withdrawable on Ethereum.
Kudos Token: 
Many people discovering XDAI and Matic network thought it would be good idea to make other NFT marketplaces on theses chain, as Opensea maked on Polygon "Matic" one.
NFT marketplaces launched on XDai chain
On Xdai, two platforms sound being trustable and usable NFT marketplaces : Cargo and Eporio.
On the first one, I find first Kudos Flash sale you could find here, offering token at lowest pricing I never saw. On second, it sounds there would have also more and more user bringing their tokens into marketplace.