Do you have any idea what the cost is to restore 50 TB from that?
I assumed you’re only paying per GB storage. At least that’s what their S3 pricing page says. I believe transfer cost only applies if you transfer from one S3 solution to another. I’m not using it myself, so I don’t know the details. Please correct me if I’m wrong.
What happens when they decide to raise the price?
If you depend on AWS you’re doing something wrong. You should at least adher to the 3-2-1 backup plan. If you do so, you can switch away from AWS any time they change their policy.
Telegram is not private at all. Nothing is encrypted except Secret Chat.