Print screen is the most basic method of copying content, so it needs to be included for this plugin to do what it says - protect content.
With this plugin installed, sure, I could not select text nor see the right-click pop-up menu. However, I could still use the hotkey CTL-ALT-PrtSc to take a copy of the homepage and paste the image into a simple graphics editor.
I am using the latest version of the Chrome browser.
4 months ago, @shirtguy72 wrote in his review that this is the only plugin that does what it says (I'm tagging him here in case he is not aware of this issue). I would say that this plugin is probably the only one that DOES NOT do what it says (i.e. it is not an Amazing Content Protector), at least compared to one other more effective plugin that I have tried.
I'm looking to replace the other protection plugin I am using only to improve my site's Google Pagespeed Insights score and warning messages.
I will update my rating as soon as print screen protection is added.
*EDIT - I've increased the rating from 1 to 4 stars.
I suppose plenty of people don't need to disable printscreen copy functionality to protect their work and would be more than happy with this one. So 1 star isn't fair for an otherwise reliable free plugin.