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As a rule, they release a ton of repacks, and only a few are made the way you describe. Many amateur enthusiasts try to add their own touches and claim that their repack is the best. And sometimes, this very enthusiast is not even 15 years old. They mess around with things and don't even understand what they're doing. I didn't immediately ban him, but after several of his unsuccessful experiments. Thank goodness, it didn't come to reinstalling the system, but a considerable amount of time was spent cleaning his computer of this garbage.

As a rule, a normal repack includes a description of what has been done. Whether something has been removed from the game, whether the sound or video has been recoded into a different quality, etc. That is, there is a specific description.

And I highly doubt that the person who does all this is 15 years old. Because understanding disassembly and debuggers at that age seems unlikely. It's more likely that this individual will be playing Dota, CS, Mafia, and spamming in various chats and forums, etc. Although there may be a few exceptions. But I have serious doubts about that.

Regarding unsuccessful experiments and cleaning the computer of various garbage, there are many programs for this. For example, Total Commander has a program called Revo, which not only removes a game or program from the computer but also removes all entries from the system registry in 5 minutes.