Training data for LLMs immediately springs to mind. They've had a free pass so far but there have been numerous threads on HN talking about server costs ramping up. People are creating zip bombs etc. to combat the LLM companies. Artists are not happy about content being ripped off.

If you consider that AI agents may end up autonomously designing, building and running SaaS-like products, or API microservices, it makes sense that they should be able to pay systems in stable coin. It allows them to operate without the restrictions put in place by traditional financial institutions. That's my futurist opinion.