>due to selection bias, those "services" and the people providing them end up being heavily on one side of the political spectrum
>deus ex machina (no, not really)
>wonder why people on the other side of the political spectrum refuse to trust your fact-checking "services"/media
Online user-generated-content moderation systems (whether upvoting/downvoting, Slashdot-style, etc.) are just a type of "fact-checking" in practice.
When the ability/opportunity to act as a moderator within such a system depends on conforming with the community, then biases can become repeatedly amplified over time, and the results of such moderation become questionable to a sizable part of the population.
I pretty much made all the inferences I will ever need about the valley-type demographics back then. Nothing since has disproved any of them.
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