https://ghacks.net/2023/11/11/mullvads-public-encrypted-dns-servers-run-in-ram-now/
Sweden-based VPN provider Mullvad announced today that its public encrypted DNS servers run fully in RAM.
Harder, yes, but still good to note not impossible. There's some cryogenic techniques that allow them to preserve what's on the RAM long enough to read it.
It's a bit of a long shot, and I'm not sure if it's just theory or proven in reality. The idea is that you literally freeze the memory at a cold enough temperature to freeze the state of the memory, and then swap the memory into a machine with power in order to read or dump the data
It's a variation of a cold boot attack. Instead of forcing an OS crash and rebooting into an OS connected to a portable drive, you cool the memory to extend the time you have before the data degrades and can then do whatever you want with it. I believe you can extend it up to a week.