Yeah, 2257 really should be responsibility of only the site owners and those who are direct business partners like the processor.
I'm not a lawyer, nor do I play one on TV, but historically the safe ground for link lists and search engine has been to completely avoid exercising anything that might be considered editorial control. If you require 2257 compliance, then you're putting yourself in the position of having your users assume that's responsibility when they're on your site, and perhaps assuming a bit of liability.
That's unlikely and a bit of a stretch, but I dont see any advantage or positive impact from requiring it.
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