[NoGravitas]

Many (most?) of them do open source their drivers. But even then, no one is willing to do the work to upstream them.

[yareally]

They sometimes release the driver blobs so you don't have to rip them off the device, but rarely have I heard of drivers being open sourced outside of a few scattered instances.

[dispose13432]

Really? Where is the full Samsung blobless kernel?