There is another side of the coin: Not to directly defend easter eggs but if we allow people to insert easter eggs, sure it creates slightly more work and pote

There is another side of the coin: Not to directly defend easter eggs but if we allow people to insert easter eggs, sure it creates slightly more work and potentially create an attack surface (albeit very unlikely), but in return you get something hard to measure directly. People love and embrace what they work with, they care about the project, spend extra time on it because it creates belonging and sympathy. It makes a little happier developers and a community, which eventually results in a better-cared project. Even knowing any potential downsides of adding an easter egg to a program, I think upsides are a little higher. It's just hard to quantitatively measure.