5G is a directed energy weapon. It gets sold to the public as an entertainment gadget infrastructure ("watch your videos now everywhere in 4k!!!111"). The trendies gonna love it and bitch about it untill every small town has its own 5G grid ("not gaving 5G is soooo 2017..")… In reality 5G fucks up your cell replication. It shoots shit like cat videos on the same "channel" your mitosis arranges the telomeres for dna replication within a cell. Cancer rates will explode. Big Pharma can cash in.
Think damage over time.
Its a technique to phase out cell based organisms over 3-4 generations. The victim will drmand to be targeted by the weapon. Loving the bomb so to speak.
Its something sinister like evil aliens would use to conquer a planet without firing one shot.