On the contrary, you're vastly underestimating the availability of various "booting" and "IP stressing" services that sell a 30 minute 1Gbps+ DDoS attack to anyone for $5. Launching a DDoS attack is just as easy, if not easier than, signing up for Netflix. Many of them even offer cheap monthly packages for people to use at will with no marginal cost to them.

I've personally been on the receiving end of one of those for somehow pissing off a cheater in GTA 5. It definitely happens and it's not fun.