It is stealing by definition lol. Where the hell do you come up with this? To wit:
gerund or present participle: stealing
1. take (another person's property) without permission or legal right and without intending to return it.
It's not generally charged that way in court but it is stealing. Whether it is physical or digital is irrelevant.
Copying is most definitely not stealing. If someone built an exact replica of your house did they steal your house? No, because you still have your house. If someone makes a copy of your digital file, they didn't steal your file, they made an exact replica.
Except for the part where digital software is sold as a license or a product key. Your example is predicated on the idea that you're just copying the software itself, which in most cases simply will not work without a further crack or a license generator.
Piracy is more akin to using a credit card number somebody stole and then using it to make a purchase for yourself. You didn't steal the original file/card number, but you are using it without the intent to pay for it or return it. You are stealing money in either case.
I already explained it once. Most games need a key or license to work in digital form and that is where it becomes stealing as you are intending to use the product without paying for it. I literally copied the definition above.
In the event you are getting a game that doesn't require a key, you are still not likely to be doing the copying yourself of the original file meaning you're taking possession of something you know to be copied or stolen, making you an accessory to the original crime.
You're ignoring the key/license scenario still. What you're describing is fine because it basically defines shareware. So to use a similar scenario, what you're describing is the same thing as walking into a movie theater and filming the movie, without paying for a ticket, to keep only for yourself. Still illegal, but not theft by definition because you didn't have to do anything to it to keep using it. Different.