Clearly these tactics are despicable...and they work. Bloomberg is just demonstrating that he's the only one who really learned from Trump how to win in the modern era. Trump, of course, had Russian trolls posting rather than these folks...but potato/potaato.
And he's right - he went from nothing to third place (in national polls) solely through (mostly internet) ad spend.
What I don't understand is why every candidate isn't taking a similar approach. These guys are showing it's not about events, likeability, policies, history, etc. It's just about mass manipulation enabled by the internet.