In Sweden, physical search of the drives is a real concern. The Swedish national police attempted to search Mullvad once, but since there was no data to seize they left empty handed.
They were just unprepared. There was plenty of data to seize, but it was in RAM. They just needed the right equipment to do a cold boot attack [0] [1]
"The HotPlug's patented technology keeps power flowing to the computer while transferring the computer's power input from one A/C source (such as a wall outlet or power strip) to another (a portable UPS) and back again."
no they haven't built an impregnable system, neither has anyone else in the history of the world.
they have raised the bar very fucking high, though.
normal vpn company: oh yes, Officer, here's their credit card details and a list of all IPs they've ever connected from, and DNS logs from our internal servers
mullvad: OK, I guess you have the corrupted partial contents of memory of one machine that you managed to dump after dawn raiding us with guns and using liquid nitrogen to freeze the DRAM for a cold boot attack where you now have 90 minutes before entropy claims another victim.
one company tried a lot harder and made things a lot better. dumb equivalence arguments are dumb.
I think you need to familiarise yourself with the Mickens Security Model: https://www.schneier.com/blog/archives/2015/08/mickens_on_se...
making yourself resistant to casual subpoena attacks for little cost is valuable thing for a lot of people.