I've not had problems using the EK Wifi for "low usage", ie browsing (not heavily graphical websites), Whatsapp, E-Mails, all worked fine for me.

And if I paid 1$ for something, I don't expect it to stream HD Youtube videos. If With Swiss, the cheapest package starts at 9$, yet it will be heavily "cut" connection: "We offer SWISS Connect on board the Boeing 777-300ER. The WLAN connection is fast enough to access your emails, use social media sites or simply surf the Internet. We only advise against streaming or using voice services."

So: Probably clear-cut stuff like Skype will be blocked. Whatsapp calls? According to Swiss they advise against anything "voice". Streaming - and be it a radio - advised against, etc.

Meh, I prefer to pay 1$ for something that might be a bit slow and I've to wait 10sec for a Whatsapp message to be sent, over paying 9$ (and watching my data usage very carefully..) to be able to do.. exactly the same, just with a limit at 4% of what EK offers..