Those are the obvious backdoors. The uh marked special police entrance, if you will.
It is subtle - most have never heard of it. I tried to bring attention to it on old-Voat and was flooded by no less than 6 shills trying to damage control it. It became a spectacle as they made a public mess, to the point where people were making threads just on the damage control.
I wonder about the more subtle ones.
These are found by looking at overly-specific parts of specifications. For example, the NSA helped developed the IPv6 spec. One of the 'overly specific' parts requires the addresses to be region locked. I assume this is to eventually break through the 'my IP isn't my identity' barrier that has stuffed e.g. RIAA/MPAA lawsuits.
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