Instagram posts for personal trainers?

I’m considering building an app that helps personal trainers share (among other things) Instagram posts about wellness, nutrition and fitness.

Topics would be suggested by the coaches, and all posts would be manually reviewed by the personal trainers before being shared. The trainers are also fully certified.

I understand that " * Tweet generation and Instagram post generation are disallowed." per the guidelines, but this seems aimed at auto-generated babble/spam, as opposed to human-guided, useful content.

Would this usecase be permitted?

Relatedly, I noticed provides a tool for Instagram captions which basically provides this exact functionality (in a more generic way). Why would they permitted to provide support for Instagram if it’s disallowed per the terms?

I think they are figuring it out as they go. You should do an app request.