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Got it! reCAPTCHA v3 is designed to be less intrusive by analyzing user behavior to determine if they're human without requiring interaction. The cost structure for reCAPTCHA v3 is similar to other versions:

- Free Tier: Up to 1 million assessments per month.
- Enterprise Tier: Custom pricing based on usage and additional features.

Despite its advantages, some websites might still avoid using reCAPTCHA v3 due to:

1. Complexity: Implementing and fine-tuning reCAPTCHA v3 can be more complex compared to simpler alternatives.
2. False Positives/Negatives: While it's less intrusive, it can sometimes misclassify users, leading to potential access issues or security gaps.
3. Privacy Concerns: Similar to other versions, there are concerns about data collection and user privacy.
4. Cost for High Traffic: For websites with very high traffic, the costs can still be significant if they exceed the free tier limits.