Growth features will soon be default on Wikipedias: T275069: Scale: deploy Growth features to a new set of wikis. It means that some non-Wikipedias will soon like to get our features.
At the moment, these wikis con get the features "as they are". French Wiktionary has them, with limited features. It is time to think about what "as they are" means for these wikis, since our features evolved since we decided this.
We have some features which are designed for Wikipedias, such as add a link. But things like the Mentorship module or the Homepage can be interesting for non-Wikipedia wikis.