Privacy policy for publishing app on iTunes Connect?
Yes, you can host the privacy policy on a 3rd party website. This StackOverflow answer addresses your query:


  there is no way you can just copy-paste the text, you need to link to a privacy policy on a website for iTunes connect. 
  
  I work on a tool called iubenda that fixes this exact problem for app developers and returns a privacy policy url right after the creation of the privacy policy. You might find it useful: iubenda.com
  
  Also, I've written more about the exact process of the addition of privacy policies on iOS and the App Store, this could help you out as well. Hope this helps!