Cool, but not something I would ever pay for. Of course, I don’t have any reason to believe that a government or private entity is targeting me for espionage.
I would assume that some companies are offering this service for government agencies and corporate clients, but they probably don’t publicly advertise it, and they charge a lot more than Purism.
Before Purism started offering anti-interdiction services, there probably wasn’t much of a consumer market for it. By offering it at a low enough price and by advertising it, Purism is creating the consumer market for it. It wouldn’t surprise me if other companies start copying Purism’s anti-interdiction services in the future, now that Purism is demonstrating that there is demand in the market.
The Librem Key can detect tampering with the boot software, so it prevents rootkit attacks, and presumably you have disk encryption, so that should prevent tampering with the operating system and your data.
For hardware tampering, you can look at the tamper-evident tape to see if the package was opened and look at the glitter nail polish over the screws to see if anyone has opened the screws. Presumably, someone could use nail polish remover to take off the old nail polish and paint on new nail polish over the screws, but Purism sends you photos of the laptop and its packaging before it is shipped, so you can compare the tape on the packaging and the glitter pattern on your laptop’s screws to see if it matches the photo. I don’t know if the photos are high enough resolution for this to really work, but it should work in theory since the glitter pattern over each screw should be unique and you can’t recreate it.
Purism also includes a photo of the laptop’s internals before the back case is attached, so you can check if any hardware spying device has been added to the back side of the PCB. However, if the spying device was applied during PCB assembly or put in between layers of the PCB (as was reported with Supermicro), then anti-interdiction will not detect it.
Purism released the schematics and x-rays of the Librem 5’s PCBs to prevent the insertion of spying hardware during assembly at the factory, but Purism can’t do that with the Librem 13/15, because the PCB is based on copyrighted Intel reference designs, so Purism can’t publish the schematics and I assume that Intel also has restrictions on publishing x-rays as well.