Well it is hard to say now how these services performed globally. That is her main point. You can build a great self-hosted service in the US and EU, but will it work just as well in [anywhere else]?
Noone could use ICQ on their mobile device either, so that also added a lot of additional challenges.
There are literally ICQ-compatible apps for android, as well as any of those other services which have bothered to keep their servers running. Mobile devices add nothing to server requirements.
They do. Without push notifications you are not getting instant messaging when the app is in the background. At that point you could just use email instead.
Well it is hard to say now how these services performed globally. That is her main point. You can build a great self-hosted service in the US and EU, but will it work just as well in [anywhere else]?
Noone could use ICQ on their mobile device either, so that also added a lot of additional challenges.
There are literally ICQ-compatible apps for android, as well as any of those other services which have bothered to keep their servers running. Mobile devices add nothing to server requirements.
They do. Without push notifications you are not getting instant messaging when the app is in the background. At that point you could just use email instead.