Yes, it is a chance for Tezos NFT marketplaces to continue developing. OpenSea not integrating Tezos provides an opportunity for Tezos NFT marketplaces to focus on developing their own platforms and services without having to compete with OpenSea. This allows them to focus on building out their own unique features and services, which can help them to stand out in the market. Additionally, the lack of OpenSea integration also provides an opportunity for Tezos NFT marketplaces to build relationships with other exchanges and platforms, which could potentially lead to additional exposure and liquidity for their NFTs. Finally, the lack of OpenSea integration could also provide an opportunity for Tezos NFT marketplaces to attract Ftx, Eth Whale, or VC investment, as these entities may be looking for opportunities to invest in projects that are not already supported by OpenSea.