Hi guys, I heard the following. Someone had problems finding a matching opponent and he was told that his account was marked... A short research revealed that the usage of „chessguard“ software which automates the connection of the DGT board immediately is detected as „cheating“ because of the somewhat „automated“ mouse or automated inputting. It was quickly confirmed by lichess.
Don’t ask me technical details. Hope this is ok to post it here to clarify matters.