I'd day that hedge funds and quant trading firms are an exception to this rule. If you get access to their model training code, order execution code, and especially their trading strategies, then that is literally valuable since you'd be able to replicate their success.

This is unlike most other companies, say Spotify, where if you get access to their source, there's still not much that you can do with it.

It is in some projects, OP gave a good example: hedge funds.

Especially if it can be generated with a prompt.

No, code becomes less valuable with the passage of time.