The two small logos on the status bar are for Indonesian mobile service providers (Telkomsel and XL Axiata, I think).
That's right,,, it is one of the cellular service providers from Indonesia that I am currently using Telkomsel with a WIFI connection not from the card provided by the provider.
So I assume he is from Indonesia which is not restricted according to Roobet's ToS.
The reason why the website doesn't load is most likely slow internet connection, which happens to me all the time when I connect to public Wi-Fi, or because he has Javascript disabled on his browser. The latter is less likely to be the reason since he said he tried different browsers.
No wonder when I use Telkomsel from a GSM card there are always many obstacles including from a bad network but it also depends on the particular region and often I experience the same difficulty opening several gambling sites because the network is very bad, but I am now using Telkom WIFI all went well and some of the sites I visited had no problems at all.
Roobet does not have any restrictions for Indonesia, so I'm happy.