Disclose at the start, every time. Hiding it breaks trust, and often the law.

Always disclose sponsorships at the start, clearly, with the platform's tag. It costs a little credibility; earn it back by showing genuine use and naming one honest downside. Hiding it breaks trust, and in many countries the law.
S Evidence: strong. Large trials or many studies, pointing the same way.
Eisend et al. 2020 · Liu & Zhao 2025 (meta-analyses).
Not medical, legal or financial advice.
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