In most cases, merchants cannot see what other affiliate programs you belong to. Affiliate networks usually keep this information private. Each program works like its own system, and they do not normally share data about where else you promote. However, if you openly promote competing products on the same website, a merchant might notice by looking at your content. This is more about visible behavior, not secret data sharing. Keeping things honest and balanced helps avoid problems. Do you think this kind of privacy is important for affiliates to grow freely?