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Odd take on a post called "applications of category theory"

I mean topology didn't have so many applications 100 years ago, but now that shits everywhere. Math is the ultimate r&d. It's literally the language of causality. Imho it can't not be useful.

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I have looked into applications of topology a lot and "everywhere" seems like a stretch, though perhaps you mean it in a particular sense that differs from mine. Could you give some examples of what you think of as the most useful practical applications of topology?

I believe it's used in cosmology to depict the "shape" of the universe

It is used everywhere. ML/AI would be a good example.

Give me a specific example. Maybe a link to some code, or a design doc, where topology comes into it.

If you're thinking about "topological data analysis" and "persistent homology" or similar, I have been down that road already and consider it a dead end (nobody uses it). See: https://buttondown.email/j2kun/archive/whats-in-production/

I think you're confused about what "applications" means to mathematicians

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