Board Game Arena

What's the meaning of following message in some player's profile?
Some are -10 karma, others are -30 karma...

0 [red thumb emoji], [devil(?) emoji] O days ago, (Moderation) -10 [karma emoji]

What faults have they made for that?

and I found some are -3 karma...
Is there any new rules for karma penalty?
I can't come up with anything