They are selling a look or aesthetic, it’s harmless and getting worked up about it will only create unnecessary issues. So long as you have clear boundaries in your relationship there won’t be any problems. Not worried about it but I would see a 1 point drop in IQ for each one followed if he doesn’t know them.
What happens after 10k followers on Instagram?
Once you have 10k followers, Instagram will make it easier for you to get people to your website via Stories with the swipe up to link feature. Swipe up is the only way to get a direct link from your Instagram to your other web properties. And, it’s available in STORIES, if you have 10k followers.