Are you suggesting that Instagram has suddenly banned all of us? I don’t think so.
There are several thousands of SNAP users. Instagram is working fine for all of them. I am not saying that Instagram banned you. Instagram has a very sophisticated SPAM filters and they use a combination of dozen different factors to determine SPAMmy content. That includes your account reputation, your IP, relevance of your hashtags and even content of your images.
So the selfie posted from cellular provider IP will never go to SPAM and will improve your account’s reputation. Some picture that contains text on it, URL in the description, a lot of hashtags, and IP from Amazon AWS, will certainly hit the SPAM filter and downgrade your account rep.
Please instead of trying to prove us wrong, just try what we are suggesting.