Possible Clues:

• They don't play for pay
• Open mic participants
• People who aren't pro Republican in Team USA, curiously
• People who are unprofessional?
• You are soundly invested in a partner's lovers
• A partner from Russia reading up on introductory synopsis to Corinthians
• Athletes who aren't paid
• Nonprofessionals
• Open mic night performers, often
• Open-mike night performers