Eh, I think it can be useful to others. Your point about Amazon being explicitly part of some of the names is certainly fair. However, a few months ago I saw something on HN that has had me informally polling friends to see if they know who owns YouTube. I find it so obviously owned by Google, but to my surprise most of my friends I've asked didn't know (20s, some of them in PhD programs). Well aware this is not a statistically valid poll, but my point is that there are at least some well educated people who have no clue about some of these corporate relationships.