<https://airvpn.org/forums/topic/24349-how-to-airvpn-via-sslstunnel-on-android-678/#comment-69170>
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"Yes, there are some reasons:   First, I have doubts regarding the app's maintenance status (last updated July 2015) and its obscure developer (website SmallApps.eu = 403 Forbidden).   Maybe most importantly though, I avoid recommending software that is exclusively available through proprietary channels (Google Play Store). There is no F-Droid version or access to source code available. "
<https://airvpn.org/forums/topic/24349-how-to-airvpn-via-sslstunnel-on-android-678/?tab=comments#comment-68548>