Everything Search: https://www.voidtools.com/
Everything Search uses the NTFS indexes to do blazing fast file or folder searches. It has a neat and clean interface, and no nagging ads (unlike.. cough, cough.. Windows 11). Everything Search is one of the first tools I install on any new Windows PC.
Once the feature exists, it's much easier to use it by accident. A finger slip, a bug in a Windows update, or even a cosmic ray flipping the "do not upload" bit in memory, could all lead to the key being accidentally uploaded. And it's a silent failure: the security properties of the system have changed without any visible indication that it happened.
I don't think this is really helping the site owners. I suspect it's mainly about AI extortion: