Does you argument also apply to Wikipedia and Musicbrainz?
They are both open (Musicbrainz is even public domain) and you can download the entirety of the database
Both are crowdsourced pieces of knowledge

To a lesser degree, you can also get the data of TMDB with some workarounds (example: developer.themoviedb.org)
So they arent exactly locked into their knowledge vault and can be downloaded daily just in case of a bail/bait and switch