The real problem here is not the chain of marketing tech that allowed this, the issue is that the marketing message itself sucked. If the message was valuable, many people wouldn't have been bothered by receiving it.

As for the message itself, if their intent is to sell you that specific item you searched for, they should say so. Of course, they need to avoid the creepy-factor, which, along with laziness are the two reasons they may have ended up with the junky message you received.