कापटिकाश्चैनानल्पं प्रयच्छतः कुत्सयेयुः ॥ कZ_०५.२.३४ ॥
kāpaṭikāścainānalpaṃ prayacchataḥ kutsayeyuḥ
And deceitful persons (kāpaṭika) should shame/denounce those who give too little.
Primarily social enforcement: reputational pressure is used to raise contributions without formal penalties.