When using "not equal" conditions, a sharing rule operates on an opt-out basis, meaning that the sharing occurs unless certain non-sharing conditions are met. As a best practice, especially when sharing CRM data with external users, one should define the sharing rules on an 'opt-in' basis. This approach keeps data private by default and opens up visibility exclusively when specific conditions apply.

Increased risk of data breaches, financial loss, and reputational harm. Eroding customer trust and confidence.