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> with the intention of spamming or otherwise causing harm to its users

That sounds hopelessly ambiguous to me. What if Google decides that making use of yt-dlp is causing harm to them? What is the criteria here?

We wanted email spam to be illegal and so it was explicitly made illegal. We wanted robocalling to be illegal and so it was explicitly made illegal. In such cases we have (reasonably) clear criteria for what is and is not permitted.