Historically, Easter eggs were implemented as a way of having a verifiable resume. To reduce employee bargaining power, companies didn't include developer names in software credits. So even if you worked on project X, even if you designed and wrote the entire program as was common at the time, the developer didn't have any proof they could use on their resume. But, if you sneak in an Easter Egg, especially one that displays your name, you could use that as proof.
So, given the antagonistic relationship in which Easter Eggs originated, I'm not surprised that large companies would continue that antagonistic relationship.
I stuck difficult-to-find easter eggs in my game cartridges precisely because I wanted to prove that I'd written them. The eggs are not spectacular, nor do they subtract from the player experience. It was just signing my name, when I wasn't allowed to.
In Japan, game companies forbade programmers from putting their real names in their games. It was an anti-poaching move, the studios didn't want their programmers hired out from under them.
So the game programmers put aliases in instead. Hence why you see such strange names in games like Yu2, Nakazoo, Faw, S.Miyahon (who is actually Shigeru Miyamoto), etc.
Your source points out while the term "Easter egg" was coined to describe a circumstance you mentioned, the concept is older, and used for circumstances other than what you described.
So, given the antagonistic relationship in which Easter Eggs originated, I'm not surprised that large companies would continue that antagonistic relationship.
Source: https://en.wikipedia.org/wiki/Easter_egg_(media)#Origin