Mike Silagadze, CEO of non-custodial liquidity staking platform ether.fi, released an open letter stating that OpenSea halted trading on ether.fan, its NFT series backed by staked Ethereum. The NFT series launched on July 11, with all 3,000 NFTs minted and over 6,200 ETH staked on the first day. But after the NFT was launched on OpenSea, the transaction list disappeared, and the new list seemed to be disabled, but it did not receive any notification or warning. The letter stated that after ether.fi contacted OpenSea, the reply received was that "NFT collections are not allowed to conduct any financial activities that require registration or licensing." Mike Silagadze said that ether.fan NFT is ETH wrapped in PFP, and this reply means that OpenSea is taking the position that ETH must be licensed and registered.