@kgb Hi there,
Glad you liked the speed test apk. They have another app that is helpful too, Spy Monitor, which tells you what IP addresses your apps are connected to, and where in the world.
Anyways, here are a couple if XDA Developer threads where block-this is discussed. There might be others too.
Hope you enjoy the app as much as I have. Although I strive to have only apps without advertising SDK's, I still need block-this on occasions. And I have also donated to the cause, which helps pay for costs. Help spread the word and another helpful app I use, is Sophos Mobile Security. Another free, ad free app, that is very comprehensive. Likely the only one left that is still free on playstore.