"make sure public access is severely restricted"
What I will never understand is how someone can set up an AWS account and not think of locking it down from public access.
You're putting data on the Internet, don't you realize that ? It doesn't matter what kind of data it is, lock it down tighter than a gnat's arse. If somebody with actual authority complains, you can always relax it a little in his favor.
Better safe than sorry, right ?