If AI tooling starts to seriously chip away at those foundations then it puts a large chunk of their business at risk.
You can be a huge, profitable data-only company... but it's likely going to be smaller than a data+interface company. And so, shareholder value will follow accordingly.
The assumption is that Claude has access to a stream of fresh, currated data. Building that would be a different focus for Anthropic. Plus Thomson Reuters could build an integration. Not totally convinced that is a major threat yet.
Again, unless Anthropic are taking on liability for their legal tools, this is not going to impact TR.
That being said, there probably is a potential company here that's gonna be built soon/is currently being built, but it definitely won't just be a wrapper around Claude as the recall will be way too low for these systems unaided.