SOLVED: Watch out for DAN/GoDaddy
EDIT: they later apologized, fixed the situation, and explained that it was a technical error. The full story is below. We were leasing a domain name for several months, but they canceled it without any reason, notification, or explanation. One day, the domain just stopped working. We even have 2-day-old emails from their team saying that we made the last payment. Now, our website and all email profiles are not working. If you are considering partnering with DAN.com or GoDaddy, we would definitely not suggest it. We spent several months building our website and gaining customers, as well as hundreds of euros, and now everything is gone.