If editors think that a website justifies multiple listings, they are at liberty to implement them within reason.
If a website promoter ignores our submission guidelines and suggests a website to multiple categories, he's violating our ToS and is spamming. Whether or not that attracts sanctions all depends.
There are exceptions (that, from your example, probably don't apply to you) for
- suggesting a website to a topical category and to a Regional category.
- suggesting a multilingual website to multiple World categories.