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Hi there, Pinterest traffic engineer here. I've added a task to take care of this. Thanks for the suggestion!

I'm embarrassed I didn't say "please". But thank you!

Agreed, or implement RDNS verification like the major search engines do.

What's the problem with other bots appearing as pinterest?

Simple economics: they get some value from having their content on Pinterest. There is no value (that they could see) from having their content scraped by other bots.

If that's the only reason then I hope pinterest doesn't publish their IPs.

That's terrible for whoever the next big Pinterest is.