>Over the past year, we’ve meticulously scraped all Worldcat records. At first, we hit a lucky break. Worldcat was just rolling out their complete website redesign (in Aug 2022). This included a substantial overhaul of their backend systems, introducing many security flaws. We immediately seized the opportunity, and were able scrape hundreds of millions (!) of records in mere days.

>After that, security flaws were slowly fixed one by one, until the final one we found was patched about a month ago. By that time we had pretty much all records, and were only going for slightly higher quality records.

OCLC carelessly fiddlefarted around with their moat and lost it. Poof!