It can be worse: on a recent post here[0] the author says the contact page on his blog "does nothing but wastes spammers time and effort"[1]. Granted, he links to an email on said page, but why include a fake contact form[2] on your page then?

[0] https://news.ycombinator.com/item?id=48508069

[1] https://bruceediger.com/posts/honeypot-design/

[2] https://bruceediger.com/contact/