In English Wikipedia this is called "deletionism". Although I'm not a huge fan of it, deletionism has had its successes, when seen in a wider context — namely the creation of many, many more wikis on the Web than existed when Wikipedia was new.

For instance, there were once Wikipedia articles for each creature in the Pokémon games. This was a source of some mockery. Today, those articles have been deleted from Wikipedia, and replaced with short summaries in list articles. instead today there is a whole dedicated Pokémon fan-wiki, "Bulbapedia", with a lot more information relevant to game players than would ever make sense in a general encyclopedia.