Yes, if you set a bucket of folder in a bucket public, anyone can read from that bucket. I put a warning letting the readers know about this as it is not recommended by AWS security policy, but many people ask for or want this functionality so I showed how it could be done as well.
Can public users of the S3 bucket just read from it or write into it as well? How to make it more secure?
Ah, no they would only be able to read from it using the instructions here. To make it secure from reads as well, see the other example I provided in this tutorial.
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