I had never posted there before and if I was banned before I wouldn't be able to press on Create Post. I checked but have never received a message before from r/bangladesh that I was banned. I think they have an automatic filter that picked up on the words 'US sponsored coup'. Can someone post the same picture as me with the same text to see if this is not just a me thing? I checked, I can create comments in other subreddits but can't post comments or posts in r/bangladesh anymore even though I didn't receive a notification I'm banned. I can't even see the list of moderators of r/bangladesh anymore.
But another reminder the Reddit is a US website with links to their government and a lot of national subreddits are compromised like r/afghanistan
I found a YouTube link in your comment. Here are links to the same video on alternative frontends that protect your privacy: