To be fair alot of these games can be aquired and made to work through various legel and non-legal means. I 'downloaded' a copy of 'A Final Unity' and once o got it working with dosbox bought a copy of the game disc online (i still had my original box from years ago).
Until these people sort out licences for these games so we can rebuy them properly abandonware sites are the way to go
Well, with the updated copyright that is on the images, it is looking like the licences have been sorted out. The thing is, some people don't have the knowladge to get the old games working, this is why GOG is so useful, and usually the cost isn't too high, so it'll open up these old games to new people, or returning players.