Yeah, I remember noticing Google doing A/B tests on the color of links. A/B test everything! Few may die-- more may live in the long run. (If that's what you're trying to optimize.)
The "famously" tested 41 shades of blue in the 2000's, again a couple of years ago[0] and I am sure they test this again some times to times.
If there is a better color then it's guaranteed to save lives in the long run.
Not if AI kills us all before the test is finished.
Yellow is garbage. Nothing good ever came of yellow. If anything is going to cure, it's indigo.
McDonalds famously uses yellow to get people to eat and leave in a hurry.
Lavender and violet are universally calming in humans. I don’t have the links handy, but color psychology doesn’t vary much by individuals, it’s something somewhat hard wired.
Don't think Amazon hasn't tried every shade of orange that's plausibly on-brand.