Summary
Google is now stricter in devaluing content that doesn't meet certain classifiers, resulting in its removal from the index. Influential factors include domain history, trustworthiness, link history, and brand signals. The performance of content over time and user behavior are also significant. The author believes Google is adjusting SERPs based on behavioral data across site profiles. High-quality content is being removed from SERPs, and non-compliant sites are dropped from the index.