The site confirmation e-mail contains a visible pointer to a website (huggingface.co) backed by a reference to a website (xwo7x.mjt.lu) that is not even close to being the same website. This is a classic phishing ploy. Thunderbird refuses to follow it without warning the user (several times) that this is a bad idea. Please consider fixing.
Hmm, thanks for the report. We are using Mailjet as email provider, so they replace all links with a redirect service to be able to provide analytics on open rates/etc.
Will try to investigate if this can be changed in the future