It's up to the congressman to weight all evidence and data available and come to well informed conclusion. If they are incapable or unwilling to do that that's a different issue.

> Congress can and does ask companies for their expertise/stance

They are inherently incapable of identify all these companies or measure the impact of their policies on their own, though (which is perfectly understandable, well I guess these days they can use an LLM to make this easier... /s)