The loser's car gets a temporary vinyl wrap or window decals advertising their fantasy failure for a set period. It turns their vehicle into a rolling billboard of shame. Magnetic door signs are the budget version.
The long haul: this is not a one-afternoon sentence. With a time commitment of one month, the punishment keeps paying out (for everyone else) long after the season ends. Long sentences need a written end date and a league-appointed enforcer who checks compliance.
Seen in the wild: fantasyfootballunlimited.com