I was wondering about this.

Recently, i managed to install Time Crisis 2 in my PS2 through a USB with mcfree boot thingy, so my question is, can be categorized as an unfair advantage if i played this way? i've been trying to get a physical copy of the game but they are extremly rare in this part of the world.

That should be okay, provided the file has not been edited or enhanced in any way. Good luck on the runs!

MR