It’s about how solid the food is and this how far the mycelium (roots) of the mould can penetrate.
The CSIRO (a govt run scientific body in Australia) once issued a list of foods you can just cut the mouldy bit off. [Link.](https://www.news.com.au/lifestyle/food/csiro-identifies-foods-that-are-safe-to-eat-when-mould-is-cut-off/news-story/6c828916672e6177daba1456c61bb70f#:~:text=Foods%20you%20can%20save%20(if,away%20from%20the%20visible%20mould.)
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