Yes. Every case study is a real project. One client account is kept private on purpose, the malware cleanup, because it involved a hosting account with many clients on it.

Because I don’t have permission to publish every client’s analytics, and I won’t invent numbers. Where I can’t share a metric I describe what changed instead.

With your permission, yes. Good case studies come from clear problems, so if your site has one, I’d like to hear about it.