Shame it can't share a wifi connection through a hotspot like the now defunct FQrouter2.
Would be good if can share a VPN. There's an app that does it for rooted and for non-rooted a paid app pda-net+ ?
So instead of doing something you can do on any modern android phone for free anyway, you have to download an app and do it through that, probably sending your credentials to the company making the app in the process.. Erm, no thanks.
This might be free, but it'll be worse and slower than the hotspot feature built into your phone's settings menu.