HereForTheBeer: Well, hmm. I'm not generally keen on the concept of an "abandoned" item being up for grabs for any and all to take.
Suppose I created some digital thingamabob that I sold for a while. And now I no longer sell it - my choice to not make the product available, and the reason doesn't really matter. Do I not still retain the rights to that product, especially in the event that I may resume selling it at a later date?
LootHunter: Of cause you do. The question is what a f*cking bustard will deny people to play a certain game?
Why does one have to be considered a bastard? Note that a whole bunch of these "abandoned" games came out long before the digital game store was a thing. You made a game, it showed up on store shelves for a period, sales dropped off over time - as they always do for games - and stores no longer put them on their shelves. Essentially, the marketplace at the time dictated that the sales period for your game was essentially over except for the bargain bin. But the publisher was no longer printing disks, manuals, and boxes, and anything they shipped after that point was simply them making room for the next thing to come along.
You moved on, either to another game project or to some other income-generating endeavor.
Years later, digital game sales became a thing. People start to wonder why they can't find Game XYZ for sale online, even though it may have never been offered for sale online in the past. "I gotta have it - the game was available before but for some reason it isn't available now. Guess I can just take it." So either you let your property get pirated - because that's what "abandonware" is - or you allow it to be sold again. That requires dealing with the legal stuff of putting it on a store, or selling it to someone else so they can put it out there. That is, if the rights aren't tangled up somewhere along the line. And if you have the money to deal with the upfront costs that come with reintroducing it to the marketplace. And if you have the time to deal with it. And if there aren't other financial / legal reasons why it's better for you NOT to get it back out there.
None of that is reason for someone to decide they are allowed to have your game. Not your fault if a person didn't get to buy it first time around, or pick it up in the bargain bin, or from some online seller with a used physical copy. And there are literally thousands of other games that one can buy and play instead of simply snagging so-called abandonware.
RWarehall: I also find it hard to believe one needs to pirate any game, when there are literally tens of thousands of games out there. If you cannot find something which is expressly free to play or something which is available for legal purchase to your liking, you are doing something wrong...
So much this. ^^^ "But, but... I gotta have THAT one!" No, go play something else obtained legally.