According to Danish law they are risking 6 months of jail time (or 6 years under "particularly aggravating circumstances" but I don't think that's relevant), so not just money. The destroyed trophy, even though they weren't directly aiming for it, a good lawyer might go after them on grounds of vandalism which is up to 1 year and 6 months under normal circumstances (disclaimer: I havent't seen the video).

So far I don't think there's much precedence on it so it is hard to predict the outcome. Usually you wouldn't get the highest punishment for a first offence, so if it is jail time I'd be surprised if it's more than a month. But a jail punishment will haunt your criminal record for 5 years while a fine will stay with you for 2 years, which is actually the the worst part if you have anything but a low-level job in Denmark.