Quora collapses answers for several reasons:
1. **Low Quality**: Answers that do not meet Quora's quality standards, such as those that are poorly written, contain incorrect information, or lack depth, are often collapsed.
2. **Spam or Self-Promotion**: Answers that are spammy or excessively self-promotional are collapsed to maintain the integrity of the content on the platform.
3. **Violations of Quora's Policies**: Answers that violate Quora’s policies, such as those containing hate speech, harassment, or plagiarism, are collapsed.
4. **Negative Feedback**: Answers that receive a significant amount of negative feedback, such as downvotes or reports, may be collapsed.
5. **Author Behavior**: If an author has a history of low-quality contributions or policy violations, their answers might be more prone to collapsing.
6. **Low Engagement**: Answers that do not receive much engagement in terms of upvotes, comments, or shares might be collapsed to prioritize more engaging content.
Collapsing helps maintain the quality of the information presented and ensures that users see the most relevant and credible answers first.