I thought OpenSea was pretty decentralized, with how users can buy and sell their assets freely. From my view, the biggest centralized part in their setup is the front end. If the governments will target the websites itself, then even decentralized options will encounter problems. If governments force internet providers to block OpenSea, or Tribaldex, or PancakeSwap, that will make things difficult. Sure they can be replaced with other website, but there is less trust on a new one, and there is risk for bad actors taking advantage of a bad situation.