I asked them to elaborate on the privacy angle, and they answered (https://forums.puri.sm/t/announcing-librem-awesim-a-privacy-...) that a key point is that the SIM is registered in Purism name instead of the end user one. That would shield you from some id based tracking.
It wouldn't be hard for someone to resell SIMs (even pre-activated SIMs for a premium) to have less data on you recorded at time of said secondary transaction?
But the reseller still has to have their ID on file so they will constantly get deposed in cases where a sim card they sold was used and now the police are trying to identify the buyer. It would be a huge pain for them and I don't see it actually protecting the buyer much.
It just feels like they're taking advantage of people.
Although now that I think about it I wonder how they do E911? Sounds like a liability