Legality of training?

[BigBoi]

So, how exactly have Gameshark and Action Replay stayed in business for about the past 20 years? (yes I had an AR for my C64). They have to reverse the code to hack the memory of all the console games.

I think as long as you're not affecting the multiplayer or online portion of the game, they really can't tell you what you can and can't do to your own single player experience.

Also, last time I checked CH is selling memberships not trainers. Accessing the trainers early is simply a benefit of their membership. The trainers are ultimately released to the public for free.