Aside from physical real-world purchases, just opening up the space that agents get access to would be another feature. E.g. if you ask Claude to summarise a Twitter thread, it will say "I can't access, please paste the contents in here". That's fine with a human in the loop, but prevents it using Twitter as a source during deep research, say.
Similarly with paywalled sites like the New Yorker or research journals - If the LLM came back to you and said "I've found these 5 articles. Do you want me to add them as sources to summarise (access cost: $0.05)?" or you give it a budget upfront "Access whatever you think is most useful, but don't spend more than $0.10"
At the moment, sites either allow bots full access or block them, but this could provide a middle ground.