Why do the demos use generative AI credits

I can understand your frustration. When Adobe encourages you to "Give it a try", it's reasonable to expect a demonstration without unexpectedly using a significant portion of your monthly credits.

Unfortunately, the demos use the actual generative AI features, which can consume credits depending on the feature and model being used.

If you're demonstrating a new feature to paying customers, surely providing a few complimentary generations for the tutorial would make sense, or at the very least displaying exactly how many credits each step will consume before proceeding.

Out of curiosity, which feature were you demonstrating, and which Creative Cloud plan are you on? Losing 20% of your monthly allowance seems quite substantial, and it would be worth checking whether that amount is correct.