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I guess it could be free promotion, is not unusual for respected sites to publish affiliate links to Amazon.

MercadoLibre, one of the biggest ecommerce platform in latam, had an affiliate program, but they cut it when they were "big enough".

I think about this frequently, but they recently revamped their associates screens after years of not touching them at all. So I'd say there is a bit more roadmap.

My best answer is that right now, they realize it's best not to ruin a great thing. They're on top of the world, things are going well, why rock the boat?

I think those same things are still incentivizing the program.