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Ultimately, all the datasets on Steam are scraped one way or another, since Steam themselves don't seem to publish it. I could be that they simply never came across your project before you delisted it, and of course after delisiting it I don't think they'll ever come across it.

[bananaboy]

Hm yeah. We removed it a few years ago now so I assume they should have found it though. We followed these instructions and had to contact valve and give a justification https://partner.steamgames.com/doc/store/retire_app I don’t remember the details of the form but maybe there were options and one amounts to being delisted and another amounts to just no longer being visible and available for sale.

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"Deslisted" == "no longer being visible". If it's delisted it won't show up in search results, tag listings and more. So if you just had it online for a few weeks, that was the only moment the scrapers could find it. If they didn't catch it at that point, they'll never catch it.

[bananaboy]

Ah yeah, I guess https://steam-tracker.com/ scrapes regularly as it shows up there (it's called Resynth)