Most winningest rider at the time gets the most posts about them in the clinic, this is how it's always been.
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Lance/USADA
Froome/Sky
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Richie Porte for some reason
Not completely.
There's a clear emphasis for riders that stand out more due to a background that arouses suspicion, or due to sheer ridiculousness.
Also, I would think the majority of Clinic users is more of the belief that doping is common but there's some riders that either obviously outdope the rest or get explicit benefits connections to the right people in the right places, which enables them to outdope others with impunity. So even within the paradigm that "everyone dopes" that doesn't mean all is fair.
Also, a lot of very succesful riders have rather moderately sized threads because they didn't often win due to raw power, or because they didn't have heaps of fans denying there was anything going on.