You have no idea the amount of psychology and research that goes into manipulating people in mobile games. The Manhattan Project wishes it had the level of science that goes into Candy Crush.
Yes, 99% of mobile games are utter crap that don't try to create an actual game, only a way to make money.
My kids have only played a handful of mobile games but they have been deep into computer games for 8-10 years. You absolutely cannot just lump video games in general into that. Not to mention that I want my kids to be kids and have fun, they have also learned an insane amount from playing video games.. whether it be helping with their reading, math, optimization, and also social learning.. learning how to play together and with their friends, having conflicts and resolving them etc.