This is not new news. Most people know that the main theme from Metal Gear Solid and it’s sequel had to be changed from Metal Gear Solid 3: Snake Eater onwards because of it’s uncanny resemblance to this. Winter Road by Georgy Vasilevich Sviridov.
Yes, it’s sound very similar. But would I have known about this song if it wasn’t for playing MGS games? Probably not. I actually love Winter Road now. I listen to it often. I do not even see it as a MGS rip-off song (as I heard the MGS version first) or visa versa. It is a great piece of music. I guess people saw a opportunity to make money and took it.