I trust you that there's no direct connection, but there seems to be some correlation. Every time I have tracked text and html links separately and analyzed suspicious clicks they tend to be from the text version. That said, thank you, you've confirmed that this is not a definitive approach for sniffing out bots and it seems there may never be one. I tend to lean on downstream metrics like web page clicks and form fills to avoid the issues with email click-throughs. I avoid using clicks in scoring and triggers as well.
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