I guess most people know. It is even on the wikipedia page: https://de.wikipedia.org/wiki/INaturalist
There is a tutorial for another tool, inaturalist2commons:
https://forum.inaturalist.org/t/reuse-inaturalist-observations-on-wikipedia/27493
The former wikidata iNaturalist project
https://www.wikidata.org/wiki/Wikidata:WikiProject_Biodiversity