On the page, one option advertised is for €23.53/month with an Intel Core i7-4770, 2 TB HDD, and 32 GB RAM. What’s the catch? How is it possible to rent such hardware for so cheap?
Edit: For a little more a month, you can get a Ryzen 3600, 64GB of RAM and much faster NVMe SSD: https://www.hetzner.com/dedicated-rootserver/ax41-nvme
To be clear, I'm taking about racking your own servers, not cloud "dedicated servers"
You do need to go a bit up in price for proper server hw - although there are a few aging xeon boxes with ecc ram on the low end now.