Copilot broke your insider threat detection, and MITRE wrote the proof
MITRE ATT&CK's detection analytic for adversaries mining SharePoint describes bulk access to files and metadata in a short window by privileged or rarely used accounts. That is also a description of Microsoft 365 Copilot answering a question. The technique hasn't changed, but the baseline has, and the exposure now happens with no vulnerability, no compromised credential, and no malicious intent anywhere in the chain.