Is it because in a PC you can have other programs running in parallel that can look into/modify the memory bits of a running game and in the process “hack” it?

Is it because in a PC you can have other programs running in parallel that can look into/modify the memory bits of a running game and in the process “hack” it? But in a closed system like a game console you can’t just run your own unapproved software, which drastically reduces the number of ways a game can be “hacked”.