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There are really two viable explanations for this:
- Interference from Bezos
- The Washington Post has realised that allowing this advert to run exposes them to legal risk from an erratic administration that is extremely sensitive to its public perception.
My friend, they are a multi-million-dollar corporation. There is no such thing as integrity, only profit. It just so happens that for the greater part of their existence, having the appearance of integrity has been the best way to achieve the real goal.