Haha, I actually was discussing the same thing today! I think this is ok based on previous answers from staff:
https://forum.inaturalist.org/t/copyright-of-inaturalist-logo-etc-for-educational-use/8504
https://forum.inaturalist.org/t/may-i-use-the-inaturalist-logo-to-link-to-project-on-a-blog/2978
But if I’m wrong, happy to find out as well.