"Unfortunately, energy prices in Germany have been increasing dramatically, and electricity plays a big role in the operating costs for servers. We have always calculated the prices for the Server Auction to be as low as possible. The current prices for many Server Auction servers do not cover the increasing operating costs."
In my case, server price is going from €26 to €35, a 35% increase(!!!). Still cheap for what I'm getting but quite a price hike, new pricing starts in March in my case.
Received via email, no article on their website yet.
I've recently decided to stop renting a machine - I've had 3 server auction machines across 10 years - with 2x3TB enterprise (internal ecc protected) HDD, Xeon, 16GB ECC RAM, etc. The hw is aging, the disks were reasonably new, and it all just works, for practically pennies compared to cloud providers (no IO, no internal bw cost, fully dedicated CPUs, and so on). My reason to leave it was lack of need; I decided to move my backups and archives offline and my services to a tiny home "server".