I wonder if given the new Basic Station software there is no need to configure a router/frequency plan in TTN Console, for a TIG to become fully operational? But maybe that needs V3, rather than V2 with some bridge?
Some statistics seem to show only few have registered their TIG so far. Too bad not everyone is using the same description 
1 "Gemtek / TTN Node TTN 2019"
1 "Gemtek Femto"
1 "Gemtek GIOT InDoor FemtoCell "
1 "Gemtek IOT Femto Gateway"
3 "Gemtek Indoor Gateway"
1 "Gemtek IoT Femto Gateway"
1 "Gemtek Mini"
1 "Gemtek MiniHub MH100"
1 "Gemtek Minihub"
3 "Gemtek TBMH100"
1 "Gemtek TIG"
1 "Gemtek TTN GW Mini"
1 "Gemtek TTN Indoor gateway"
1 "Gemtek TTN Indoor"
1 "Gemtek TTN limited mini GW"
1 "Gemtek Tabs Mini Hub "
1 "Gemtek Tabs Mini Hub"
1 "Gemtek Tabs indoor gateway"
1 "Gemtek Technology Co. Ltd. MXF-MHB100 Tabs Mini Hub"
10 "Gemtek The Things Indoor Gateway"
1 "Gemtek The Things Network Indoor Gateway Conference Edition"
8 "Gemtek WLRGFM-100"
1 "Gemtek WLRGFM-100(EU)"
1 "Gemtek indoor gateway"
1 "Gemtek pico"
15 "Gemtek"
...
1 "The Things Industries Indoor"
1 "The Things Network Minihub"
1 "The Things Network ttnctl"
1 "The Things Products Indoor Gatway; 2019 The Things Conference Limited Edition"
1 "The Things Products TBMH100 (Gemtek Tabs / Mini Hub)"
2 "The Things Products TBMH100"
1 "The Things Products The Things Gateway (tabs)"
1 "The Things Products The Things Gateway Mini"
...
5 "The Things Products The Things Indoor Gateway"
1 "The Things Products The Things Mini-indoor Gateway"
I don’t know if http://noc.thethingsnetwork.org:8085/api/v2/gateways also shows TIGs that have been set up for some WiFi (and then are forwarding packets to TTN just fine), but have not been registered in TTN Console.