On Hetzner and with their €1.00 per TB after 20TB included, you can pay up to €324 per vps as you are limited to 1Gbps if you fully saturate the link all month.
I doubt you'll manage to get the exact 1Gbps per VPS out all month. On dedicated that's more likely. But luckily they have a very easy setting for billing alerts and maximum in the settings page.
Hetzner Cloud(!) only has 20TB/Month included in the monthly costs and states that you have to pay for any additional traffic. I never reached that on one of their cloud boxes so I don't know how it looks like but it definitely isn't all up front. But yes the dedicated machines come with no additional traffic charges whatsoever
Re:I got pwned by my cloud costs
by CodesInChaos on Monday January 24, 2022 @05:10AM
(#30055581)
Additional traffic costs 1 EUR/TB (plus VAT, depending on where you live). So it's about 50 times cheaper than the big clouds.
It is important to remember that not all cloud providers participate in it. For example, in Hetzner Cloud, they explicitly provide the maximum amount you are going to pay for a given instance or service in a given month. You are guaranteed not to pay more. Everybody knows why Amazon etc. refuses to do it this way.