Thanks for your response, James. Good analogy. In that respect, you're probably right - no penalty. And, no, not like it's a workaround, so I don't see Google penalizing because of that. OK - thanks for the vote of confidence.

I've recently brought on Pardot. For Campaign ROI tracking, I'm supposed to add a CNAME (I'm using .go) with /source to each source of possible first touches, like Google My Business or an industry directory. For example, to track referrals and $ROI from a directory, I'm supposed to use go.myURL.com/directoryname. Does using go. and /source have a negative impact on my SEO? Thanks for your help.