Yes, having an account is mandatory. This because of your personal details, privacy, personality report etc.
How about my privacy?
We appreciate the confidence you put in us and will handle your data carefully. We respect the privacy of Users of our site and will ensure that the personal data you provide to us is treated in a confidential manner. Your privacy is very important to us. We designed a policy to make important disclosures about how you can use Pure to share with others and how we collect and can use your content and information. We encourage you to read this Policy and to use it to help you make informed decisions.