Cats generally allow other cats to eat their food, but this depends on several factors, including the type of cat food, the cat's personality, and its health.
Cat Food Type: If the cat food is a general-purpose or all-stage cat food suitable for multi-cat households, other cats generally won't have any problems eating it. However, if it's a prescription food designed for specific health issues (such as urinary tract diseases, obesity, etc.), it's not recommended for other cats to eat it indiscriminately to avoid adverse health effects.
Cat Temperament: Some cats are territorial and may not allow other cats to approach their food due to food guarding. In this case, it's best to feed them separately to avoid conflict between the cats.
Health Status: If a cat has infectious diseases or parasites, its saliva or feces may contaminate the cat food, potentially infecting other cats. Therefore, in this case, it's also not recommended for other cats to eat its cat food.
In most cases, cats will allow other animals to eat their cat food, but this needs to be judged and adjusted according to the actual situation.