If anything in this story deserves to be called a "scam," it's not the Chicken Road game itself, but what's going on alongside it: suspicious apps, clones of the game, and promises to sell a "secret system" to guarantee winnings. Hence, my answer to the question of whether the Chicken Road app is safe is unequivocal: no, it is not, because such an app simply does not exist. The original Chicken Road including the 2.0 version from licensed supplier InOut is simply a dynamic crash game with high risk and multipliers from x1.03 to as high as x2,542,251.93.
The worst thing you can do as a player is to believe that there is a special version of Chicken Road that "closes" every round on a positive note. There is no such option. It's still gambling - once you win, once you lose, and in the long run the advantage belongs to the casino (in Chicken Road the RTP is 98%, and in version 2.0 - 95.5%).
Therefore, stop looking for Chicken Road real money app for your phone, and focus on the more important question: "where to play legally and safely?". Only at a licensed casino do you have a real chance that a high multiplier - even that legendary x2,542,251 - can actually occur, and any winnings will be paid out in full.