I aplaud the ethos of this game, 'cyberpunk' has largely become all style and no substance, so yey! However I don't understand why sticking bits of metal in your head and making you prone to viruses shouldn't lead to running the risk of brain damage or psycho-neurological issues? Seems to me that is a risk that would be run, and downplayed by the corps trying to sell this stuff, to the people in the world.
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The game's brain augments already say that many users will suffer side-effects in the long run. There aren't any specific mechanics for it because there are only a few of them (it's not something we wanted to focus on), and it would be difficult to do without running into that whole "cybernetics make you mentally ill" trope, which we're specifically trying to avoid.