...Hmm... then I need some clarification. Not just from you, but from other people who know better. Preferrably a moderator with knowledge on this.
First, I'd like to clarify something myself. I hope you're not expecting Reshade/Gshade. I don't use them because my PC kinda doesn't like it. Last time I used ReShade, it was on Skyrim. SKYRIM of all things, that game's older than gay marriage has been legal in the UK. And the fan started screaming at me. So I doubt my PC would agree with those things being on at all on an MMO. So I don't have it installed, be it on FF14, GW2, PSO2 or whichever other MMO.
The ones I use are in my NVidia card :x They're no different than me tweaking the settings of my monitor. Is Square disallowing me changing my graphic card's settings or my monitor's settings so I can tell hues apart? Because I don't think they can implement a program to scan for addons and block the graphics card. If they do, the graphics card won't work, and thus the game won't render. I doubt it'd even load. Nvidia shaders aren't a third party tool necessarily. They are third-party, but they are just as much as my CPU or monitor are. I kinda can't play without it???
I admitted I use shaders, yes... Nvidia shaders. Because, as I've explained before, changing the saturation down on things like FF14's colourblind mode does is insufficient. I need something to help me tell some stuff apart. And even then, it doesn't give me any upper edge in any case, because even with that on, P3S was a disaster. I can't tell orange apart from orange, some stuff is too faint for me to tell. It's not making stuff brighter or darker that's going to make a change on it, because it's all orange. I'd need a better indicator altogether, and I can't get that unless SE actually goes into the fight and changes how the indicators are displayed. All that I do with my shaders is just change how certain values are rendered so I can tell them apart, making dark stuff darker and bright stuff brighter.
See, this is one of the cases where I wish a mod could step in to clarify, if possible. Because I don't know whether I'm doing wrong or not. For me, this is no different than me changing the brightness setting on my monitor. But illegality isn't up to me, and I'm sorry but not you either, to decide. It's up to Square. And right now, I don't know where Nvidia stands, so I'm not even certain if what I'm using is illegal or not. If it happens to be, then I'd like to be properly informed of it so that, yes, I do stop using it.