Their VPS hosts have a 10GBit uplink, but they offer no bandwidth guarantees per VPS and state you can expect 300-500MBit/s[1]. Their dedicated servers have a 1GBit uplink with guaranteed 1Gbit/s bandwidth.

[1]: https://docs.hetzner.com/cloud/technical-details/faq#what-ki...

It looks like you have to manually add a 10G uplink to dedicated boxes: https://docs.hetzner.com/robot/dedicated-server/network/10g-...

Not quite correct. Their dedicated servers base configuration have 1gig. But when ordering you can add 10gig as an easy option (or add later). The 1 gig is too cheap to meter with free traffic. If you choose 10gig you pay for the traffic. Those who need it might use it :-)

We had a fleet of dedicated hetzner boxes w/10 gbit, it’s just an option you get and pay a little extra for. Generally had good performance as well.