Hello!
AzireVPN uses our new method, we see now from their stats. They show bandwidth in and bandwidth out of each server. They don't have graphs, stats by time periods and a ton of other features we offer, but they still show up + down ("in" + "out" in their monitor).
Note how it's not symmetrical, showing once again that your solution was indeed inapplicable. For example in this moment they declare that a server in France uses 1200 Mbit/s "in" and 109 Mbit/s "out". They also write: "Each server is connected with two 1 Gbit/s links towards the switch."
In iVPN,, oh well... that would be a server monitor in your opinion?! It's a list of servers with a percentage, no stats, no graphs, no history, no nothing...
We can't see any provider offering a server monitor like ours. To the best of our knowledge this is a very exclusive feature of AirVPN. So we can't name any simply because nobody has it. But Azire (you mentioned it) adopts the same solution by publishing "in" and "out" flow.
As shown by your own Azire example, it wouldn't be accurate.
That's of course false. You may have asymmetries which make this quoted statement false. Even a scriptkiddie modest flood counts significantly, in this case, either inside the VPN, or incoming from outside the VPN itself.
Publishing raw data as they are is the most reliable way, it's the way recommended by an important amount of community members, and it does not require data manipulation. By clicking the name of the server in our real time server monitor you can still see the distinction of bandwidth "up" and "down" of course, that feature, together with the graphs, remain.
Kind regards