I know what Sprunki is, well only brief video clips though.
However, if itch.io were to get rid any popular game just because it is more popular than anything else, it would cause problems.
1. itch.io would be harmed even more because of unfair removal.
2. Let's say Sprunki and any clones or incredibox games were to be removed here, there would be other games to replace them. What's stopping the topic author from asking similar thing? and this unfair removal loop would be repeated again n again.
If author's games were popular games here, the author won't ask for them to be removed.