when he tries to login he gets the message: "You have been banned because you have violated community guidelines. You may not appeal because we have already reviewed the decision"
What really did happen is that a fundraiser was made for him, he started to post pictures of the fire and get a lot of engagement and this likely triggered Instagram spam filters
https://www.instagram.com/puerhteashop/ pretty clearly that's what happened
What can he do now?
Please if you work at Meta or similar tech companies consider the impact your AI policies have on real world people.
Real world people can consider these services as broken/useless/harmful and just not use them? Then there's no negative impact. "Volenti non fit iniuria".
Welcome to 2022. I own no social media accounts, I have privacy, and life has never been better.
(okay, maybe HN is a social media account, but that's it)