We feel that Internet users are tired of having to sign up for site after site. If someone wants to give some simple feedback, we should make it as easy as possible. Having to go through a sign-up process will significantly reduce the amount of feedback you get.
Instead we created moderation tools that with a single click allow you to approve customer feedback or to reject it as spam or inappropriate.
We throttle certain activities to ensure single users are limited in their attempts to create multiple votes.
You should read Designing Feature Upvote’s UX for Casual Users if you’d like to know more about our design decisions that favour casual or occasional users.