I tried signing up for Instagram once because for some reason there are a lot small businesses in artsy spaces (jewelry, etc.) who basically make it the main way to interact with them (or did) and I got banned almost instantly for no reason I could discern. Kind of gave up at that point (well, after trying to go through their "show an ID process" and it not working) and if I want to see some artist's insta I ask my wife. Don't care that much about the agency stuff, but their account management situation is indeed totally broken.
Same here, I've not been able to open an account, it's a bit frustrating.
In a similar vein I made an account on ebay once years ago, and inside a day I was banned for "unpaid seller fees"
On my one day old account that had never done a transaction???