Even the two places I've worked that self-hosted bare git repos on cheap Linux VMs (both times, due to management concern about Github snooping on private code)

Even the two places I've worked that self-hosted bare git repos on cheap Linux VMs (both times, due to management concern about Github snooping on private code), no fancy web UI or anything, it was used the same way GH is, with the server acting as the hub for collaboration.