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Open3DLab, SFMLab and SmutBase say a crawler identifying itself as “trellis2-data-sourcing/1.0” and listing a Roblox employee’s email address downloaded 145.5 GB of 3D assets on October 15 and 16, 2026. The sites say the crawler visited 18,926 project pages in 26,429 requests over 34 hours, then copied 1,027 files from 712 projects. It operated from a single AWS address and retrieved, but did not follow, the sites’ robots.txt rules, according to the operators. The downloaded files included 364 files totaling 54.8 GB from 224 SmutBase projects, an adult-only site. Including adult-marked SFMLab projects, 345 of the 712 projects and 62.6 GB of the downloaded material were adult content. The operators say 423 of the affected projects carried non-commercial licenses. They blocked the crawler on October 18; it resumed requests on October 19 and 20 but was blocked. The sites say Roblox did not reply to two emailed requests for comment. The operators believe the collection may have supported Roblox’s 3D foundation-model work, but say they cannot prove the purpose or whether files entered a model. Roblox introduced its Cube generative AI system in March 2025 and began rolling out Cube-based 4D generation in February 2026. The crawler’s stated email belongs to a listed coauthor of Roblox’s Cube paper, according to the sites.