With AWS Athena, you can query the contents of someone else’s public S3 bucket. You pay per read, but if you craft your query the right way then it’s very inexpensive. Each query I run only scans about 1MB of data.

Since I was just looking at this accidentally, here are some examples of how to query at a ~cent-per-query cost level (just examples but quite illustrative): https://commoncrawl.org/blog/index-to-warc-files-and-urls-in...