Yep, it's intentional - it's actually motivated by a privacy consideration. Without removing the username for automated/bot submissions, it could leak that a person with username "foo" has visited generator "bar" via automated comment submission when they visit the page. Ideally that sort of "automated unmasking" of users should not be possible, and this design decision preserves that.

Automated comment submission is of course possible, but the (~IP based) user tag is different for each generator, so they stay anonymous unless they specifically choose to comment with their username.

because we are bot