We are using Subscribe2 and the the Subscribe2 Widget. The widget does not incorporate any of the various captcha or other plugins to require some sort of human interaction for registration. Is there some sort of plugin for the widget that would require human interaction to prevent bot registration?
For the time beeing .. no as I actually only parse/show the shortcode from Subscribe2 itself .. the very same shortcode that can be used in post/page content.
As long as Subscribe2 does not have a built in option it would be lots of work to add such a feature.