What do you mean by Pay Per Traffic ? how will it be charge?
and will there be Bless online NA Server ?
Please check Data Plans and Pricing section for details. 
Will Mudfish be adding Bless online Steam version into the game list? The game is releasing on 28 May 18
Definitely yes. Please send me some game packets using Packet Capture with Mudfish link while playing the game with Full VPN mode.
If I have game packets, it’s more easier to support it.