Product placement
Amazon: (a) it ACTS - the video implies that working at Amazon causes the situation shown, which is the context for the product use. Removing the mention of Amazon would change the implied cause of the situation.
Dr. Scholl's: (a) it ACTS - the product is used on the feet to alleviate discomfort. Removing the product would mean the problem shown is not addressed.
CapCut: (b) it merely APPEARS - a watermark at the end of the video. Removing it would not change what happens in the video.