"rightfully be abandonware"?! You actually WANT good games to be abandoned by their publishers? That is truly retarded.
And as you mentioned HOTU, allow me to quote them on the subject of games which are still available for purchase:
We strongly encourage you to buy them-- their developers need all the income they can get to make future classics for our benefit
But as the passage of a few years apparently gives you some kind of unassailable moral right to download these games for free, please don't pay attention to any of that. I'd hate for you to have to question your ethics or something.