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When scaling browser automation, generating random fingerprints for most common high entropy data points is counterproductive. It just ends up lowering your trust score and shifts attention to other browser properties with less entropy, making those primary identifiers. For example, degrading canvas, WebGL, or WebGPU fingerprints (e.g., by introducing noise like Brave does) might lead anti-bot systems to either ignore them or punish you with captchas. Once ignored, other signals, such as screen resolution (just an example), become more important.
While this helps people with privacy by blending in with users and a single user visiting a website normally will probably not notice much, an influx of multiple users with degraded fingerprints and similar resolutions become easy to detect and might get a captcha or get blocked (e.g. 30-50+ browser sessions generating cookies for a specific captcha concurrently). You can spoof multiple resolutions and then add some other properties, but it requires consistency across all of them, which can come down to weird browser specific quirks as well as whatever the data set of the anti bot vendor contains (regardless of how accurate). There are only so many plausible values for each low entropy data point that anti-bot systems will give you a high score for, forcing you to spoof as many data points as possible to maintain a high trust score across many concurrent sessions and eventually scale back or hit a limit for your operation, or deal with captchas by solving them and lose to the competition that doesn't have to do that. Fingerprinting at scale isn’t just about spoofing individual data points - it’s about aligning all points in a realistic way and knowing which and how they relate to eachother, which requires extensive data and research. On proxies: flagged IPs with residential ASNs often work fine if the overall trust score is high, but degraded fingerprints like Brave’s can undermine that advantage and then it becomes a lot more important, though it's always nice to eliminate if you are able to do so. |