The headline is misleading, the article doesn't mention using AI as a tool. They're selling scans to companies who train AI.
"Boston Public Library plans to digitize 5,000 documents by the end of the year, and if all goes well, grow the project from there."
"AI companies help fund these efforts, and in return get to train their large language models on high-quality materials that are out of copyright and therefore less likely to lead to lawsuits."