There is anti draw spam automatically already
#Is there a way to auto-decline draw offers?
cunning verge
zealous frost
That is a very good guess. The anti-spam mechanism is indeed 10 moves (20 ply) haha
https://github.com/lichess-org/lila/blob/c1e2f6a2ea926b2cf807ab4eae3c44f8118f1eb1/ui/round/src/ctrl.ts#L833
hollow plover
There is no built-in mechanism. You can program your own userscript