Plenty of things you could do.
Rename units:
Infantry = Army
Armor = Tank Battalion
Fighter = Squadron
Bomber = Bomber Squadron
etc
Alter the map slightly:
Change the color scheme…make Germany Red and Russia Green, or whatever!
Change the mechanics:
Make the player assign hit/defend/move values, maybe even costs. (Hell, this would be nice anyway!)
Any one or more of those would make TripleA significantly different enough not to be theft of concept/idea. Then if the players CHOOSE to make it Axis and Allies rules, well, that’s the players. The programmers just made a platform to play games. (Heck, the players could, theoretically, chose to play risk!)
Speaking of risk, why not put that, Chess, Checkers, etc in there too? That would lend credibility to the idea that it’s a gaming platform, not Axis and Allies clone designed to steal money from Hasbro/WoTC/Larry.