Short answer: Not yet - the in-product Report button is not built, so there is no anonymous report form to fill in today. Email reports@vizno.com or use vizno.com/contact instead. The plan when it ships is to accept reports without an account, behind a bot check and a per-device rate limit.
How anonymous reporting works
When you submit a report without signing in, you will be prompted to complete a reCAPTCHA step to confirm you are not an automated system. Once that is verified, your report is submitted and reviewed by the Vizno team the same way a report from a signed-in reader would be.
Rate limits
To protect against spam and coordinated abuse, anonymous report submissions are rate-limited. If you hit the limit, wait a short period and try again. If you have an account and are signed in, the same report form is available to you and your submission is still subject to rate controls.
When you might want to sign in anyway
Signing in before filing a report lets you optionally receive follow-up communication about the outcome of your report. Anonymous reports are processed, but there is no way for Vizno to contact you about the result if you did not provide any identifying information.