Using fake money gambling application might be a good platform to curb gambling addiction but it would fail if there is no will power or determination to quit. Like you rightly pointed out mate that these application was mainly designed to improve gambling skills and experience. It might serve as a tool of increasing the addiction. After using the application to master some skills, most addicts might want to apply those skills to real gambling. Its just like advising a sex addict to curb his sexual drive by watching pornography.
Using fake money is one of the tool can be use to gain knowledge with the game itself at the same time is make their own strategy and get satisfied or entertain if the it will be the same for long the player will tired with this same situation and that's the time they will seek for some real deal with the game, if the game is multiplier but using a fake money i guess it is good but mostly the gambling casino just offering a demo mode mostly into their slot games, but not in their table top games.