Evolution is about the survival of the individual and the species. Not just reproduction rate.
Nope, reproduction rate directly affects evolution - "fittest" is defined as having a significant advantage to reproduce and thus propagate the DNA to the next generation.
Survival of the individual matters in so much as they get to pass on their DNA, survival of the species matters in so much as their are adapted to the conditions.
Games might well have an effect but, aside from stopping people reproducing if they put all their time into it, it has dick all evolutionary effect because in order to effect evolution you have to pass on your DNA.
And, to address the thing you added to your other post; "If it's fun it must be beneficial."
Bullshit.
Sitting on your arse and eating sugar will give you happy feelings but it isn't beneficial.
Sitting on your arse and watching TV is fun but it isn't beneficial.
If anything humans have a tendency to go out of our way to do things which are 'fun' but in no way beneficial; getting drunk and mucking about is fun but it sure as hell isn't beneficial.
In fact I've no idea what the exercise link has to do with that either; while it might be fun (for me its the competitive nature of bettering yourself) the reason it is beneficial is nothing to do with it being 'fun' and to do with our heritage of our evolution to hunter/gathers and the biological changes that come with it.
More to the point it is completely at odds with your original point about addictive games being helpful because doing exercise is basically the complete opposite of being sat on your arse playing games.
Things that are good for you;
- exercise
- moderating your food intake
Pretty much it; the former just needs a routine and the latter will power for the most part (although personally I take some supplements which suppress the craving for sugar which helps but they also promote lean muscle growth which fits in with the exercises I do).