Amazon's decision to block Meta's Muse AI agent from shopping on its site raises questions about whether the big platforms will agree on rules for agents, how money will change hands, and whether shoppers want agents in the first place.

Amazon says Meta never disclosed that Muse would access its store, and that the agent doesn't identify itself while browsing

The rapid adoption of the new artificial-intelligence agent threatens to disrupt wealth managers, brokerages and insurers.