If you have a Wordpress site, I would create a “page” instead of a “post”. Page’s are a little more permanent and you get a URL like:
http://yoursite.com/privacy/
instead of
http://yoursite.com/blog/2018/09/14/privacy-policy
If it’s a page, it can easily be added to your website’s menu too.
There are plenty of free web hosting sites like WIX. I have a web hosting account at hosts4geeks.com which lets me also have https:// addresses at no extra charge. It’s about $7 USD per month for pretty much unlimited everything.
As for putting a privacy policy in your app, if you have a settings screen you can just drop a display.newText() with a tap handler that will do a system.openURL() to your privacy policy. If it’s a kids app you may need to hide it behind a parental gate.
FWIW, any ad plugin is going to use the Android Advertising ID.
Rob