open s3 bucket allow to read anyone file
Anyuser can download anyone uploaded file .
Also user may update or delete any uploaded file in s3 bucket (not tested).
AWS offer command line to manipulate s3 bucket bellow
aws s3 ls s3://mybucket -->to list all file aws s3 myfolder s3://mybucket/myfolder --recursive --->copy all file aws s3 rm s3://mybucket/test2.txt -->to remove