Lots of doctors from reputable places eg Mayo on X. Weighing in on things with media coverage like whether cholesterol drugs are a good treatment option. Possibly they're countering quakery from charlatans with good, measured opinion. That opinion could also be influenced by paying for their conference attendance, or just plain cash. Undisclosed, such payments would be far from obvious and radically change one's opinion on how convincing their case is or isn't.

The new weight loss drugs. Are they good? How serious are the side effects? How often are there problems? Is the risk low and benefits high? Are they good for cancer? Are they good to help alcoholism? Are they scary? Should I take them?

Much legit debate there and I'd rather know who is being paid for their opinion faced with the choice when trying to weigh probability in the face of imperfect information.