Do they have licenses for any of this stuff? I mean, Id/Bethesda still sells Doom 1, you can’t really call these “abandonware” by the normal definition. They’re just “really old”.
Doom is just the shareware version, just like most of the others (some already called with that fancy modern name "demo"). Some are freeware, some have been released into public domain after they went out of sale.
Is it the full game or the shareware? In another post a few days ago they said it they were only offering shareware versions. Can’t check now, I’m on mobile.
Of the current 16 games, 11 are shareware/demos. Only Beneath a Steel Sky, One Must Fall 2097, The Black Cauldron, The Lost Vikins and Supaplex are full versions (as those games have been released to public domain at one point).