"Conspiracy stories very rarely turn out to be true;"
That's because when they are found out to be true, nobody calls them "Conspiracy stories" any more. We call them "scandals". (ref: "Watergate Scandal"). Note that the perpetrators were indited for conspiracy.
"it's too hard to coordinate all of these efforts."
Every week you should be allowed to upvote something twice. Conspiracy is pervasive in life. As far as I can tell (and I provide no evidence to back this up), "conspiracy theories" are often correct but lacking the direct evidence to do anything about. Those who discount something as a "conspiracy theory" are usually (a) naive, (b) like being "right", (c) personally benefiting from the situation, or (d) going to find a way to benefit from it.
pay people to add backdoors
This is hard if you have the money? Done.
tell DARPA
When the FBI spooks go to the military contrator parties, who else do you think is there? If you know that something is tainted, you tell people who might return the favor.
start a marketing arm to convince people to use it
Some conspiracy theories turn out to be true, but the problem is that people abuse this framework to support all kind of weird accusations. It's very convenient, because it frees them from the burden of supporting their claims with evidence.
"It's a conspiracy, of course there is no evidence!"
I think its far more common to say "conspiracy theory" as a way to discredit an idea. Take 9/11 for example. Pah! Conspiracy theory. Yet the evidence is that the evidence presented by the government is total bullshit. Which is evidence of conspiracy. What, exactly, happened I expect we will never know. But the evidence is that something happened beyond planes flying into buildings.
That's because when they are found out to be true, nobody calls them "Conspiracy stories" any more. We call them "scandals". (ref: "Watergate Scandal"). Note that the perpetrators were indited for conspiracy.
"it's too hard to coordinate all of these efforts."
You're doing it wrong.