We have aggregated general FAQs here. Each tool has its dedicated FAQ sections:
What does Accessibility Insights do with telemetry?
You have the option to opt into telemetry. When you do, Accessibility Insights collects anonymized data to identify the top accessibility issues found by the users. This will help focus the accessibility tools and standards community to improve guidelines, rules engines, and features. Read more about telemetry.
How can I contribute to Accessibility Insights tools?
Both Accessibility Insights for Web and for Windows are open source in GitHub: