Yes, that ad was most likely prompting a suspect way to get traffic.
BUt traffic - yes, I will take it.
Assuming that you are only putting out great targeted content, the more traffic the better.
If I were a cafe, I would much prefer to be on a busy corner than in the boonies.
Once you get that traffic, the qualified ones will convert, if you have a good funnel.
Of course, traffic without conversions is meaningless.
Great converting website without traffic will won't get you any money in your pocket either.
I would never say no to traffic generated from good orignal content.