lichess.org is a free/libre, open-source chess server powered by volunteers and donations.
they understand very well the issue with trade: “Lichess is one of the most popular chess websites in the world while remaining 100% free. Most “free” websites subsist by selling ads or selling user data. Others do it by putting all the good stuff behind paywalls. Lichess does none of these things and never will. With no investors demanding profits, Lichess staff can focus on improving the site as their only goal.” (https://lichess.org/about)
5/5 blocks for lichess.org!