Affiliate and other links in Kindle

Hi

As I know affiliate link in Kindle are not allowed, but some still doing it.
What are the chances that amazon will catch me for that? Do they review the book somehow before publishing it?

According to Amazon I can link back to my blog....but, how many times?
Lets say I have 20 chapters, can I link back 4x-5x or is it too much? Did anyone try to put more than 2 links into the book?

What if I buy a domain and redirect it to a site like wikihow, then after my book is approved, redirect it again to my aff link?

Thanks!

They check the books very seriously before approving them and after they've approved them, too. So make sure you stick to ToS, otherwise you will risk both your author and affiliate account, too.