Ritual Loot Filter - Fair or ILLEGAL?

Right now players kinda separated into two groups, one can use loot filter in Ritual , one can't.. Since it's achievable only on PC client with modification of game setting file (technically just changing one string).
I wonder how fair it is and official GGG stand on this topic? i would like to turn it on, since it's nice QoL + i made really good identified filter, but i guess it's against TOS ?