No, I didn't want to be on your mailing list!

A year ago, I sent a letter to this restaurant, criticizing them for celebrating the 1900's, using the manner liberals prefer. I noted at the time:

I highly anticipate receiving nothing more than an automated response.

I in fact heard nothing, at least until now. I recently got a coupon in the mail from the restaurant. It was addressed to me specifically, not even with a "or current resident" tag. Thus, I have to conclude they got my address from my letter.

What kind of business adds its critics to its mailing list?