Corruption, boorish attitude of moderators and users. They threw me into a ban supposedly for cheating, in fact I didn't cheat. I do not recommend lichess.org.
https://lichess.org/@/Megarobot, https://lichess.org/@/SergeyVoronChess - bullies, that have bullying me for 1 year. The Lichess did nothing with them, but when I responded to their insults, my first account was closed, second was muted and third was marked as ToS violation.