These kind of cranks existed before the internet, and once the internet became more popular, they started congregating on USENET and later on web forums. But the advent of social media, along with the ability of its polarising and concentrating algorithms to create virtual bubble-worlds for people to live in vicariously, has explosively accelerated the ability of cranks to find each other and generate their own networks off the back of social media infrastructure. This created much more of a market for grifters and chancers to make money off these people. And now they're also being weaponised by various governments in an attempt to weaken and destroy the fabric of their enemies' societies.
I have a terrible feeling that this situation is going to get really ugly before substantive action is taken to address it.