I've wanted to automate posts to Instagram / find a way to post without using the phone (I spent a 8 months doing daily photography posts, then life happened). Turns out their API TOS is pretty strict, and requires posts to come from a phone.

A low-cost social media posting service is intriguing.

https://business.facebook.com/creatorstudio/ lets you create and schedule posts on Instagram

Interesting, I hadn't seen yet they offered Instagram posting. Usually, this would throw me into panic and worry, but I run another site (barely working anymore), which offered Twitter analytics. When Twitter launched their free and super extensive analytics platform, with super interesting data not available on any of the APIs, I thought I was done. It didn't do anything (I am not kidding) to my sign-up rates, and when people asked for certain features, I often just pointed them to Twitter's analytics instead. Still stayed with me because of one or two odd features I had, that Twitter didn't offer.

Yep this feature is also very hard to find, I just recently stumbled over it

If you change the user-agent in your browser Instagram will think you use it through a phone, thus allowing you to upload posts and/or videos.

You can probably also use an Android emulator

Main issues with the emulator are: camera needs to be simulated for some features, and they are actually quite resource-intense. Buying (or cloud-renting) a machine that runs between 5 or 10 emulators is actually severely expensive. And I'd need lots of them.