This is incorrect. Actually, yes, the files were in fact browseable and Akamai servers typically front with DNS names that presumably resolve to their any-cast

This is incorrect. Actually, yes, the files were in fact browseable and Akamai servers typically front with DNS names that presumably resolve to their any-cast addresses where they use SNI to select content bucket, so there would have been a "friendly" name involved. Going to https://server.com/folder https://server.com/folder displayed a list of folders and files all hyper-linked and connected as is common on the internet. The fact that the server was initially discovered by way of a crawler, a scan, is irrelevant (this is actually how search engines discover content, btw). The fact that a browser could browse these files suggests that it is not "well beyond the realm of browsing public websites".