Unless it was closed source / DRM-y, the scraper developer would just compiler their browser from source and fake the detection code. Scrapers that know what t

Unless it was closed source / DRM-y, the scraper developer would just compiler their browser from source and fake the detection code. Scrapers that know what they're doing could implement this in a day. There are already easier ways to detect scrapers that don't know what they're doing. And that's just the start of a long cat & mouse game that'd inevitably end up even more user-hostile and unaccessible than requiring a webcam to browse a website.