WordPress related spam

Just wondering if any of you also get WP related spam since about a month. Things like “I like your theme, but I’d like to see it work entirely” to really specific things such as “there is something wrong with your wp-comments.php file” and a lot in between. These comments are obviously spam and caught by Akismet, but I wondered, do these bots notice that my website is built with WP (even though I have the generator tag obscured, but of course it is not hard to see a WP site from the source code), is it just a lucky shot (but I never get Joomla or Drupal related spam) or could it be because I had my website in my profile on this forum (which I suppose uses nofollow)?