Because I'm sick of people saying: "You don't draw/write/animate the stuff that I do, therefore you cannot critique it properly." Um... I'm pretty sure I can. I still have eyes and last I checked I wasn't blind.
I can still see that your anatomy is shit and needs a lot of work, that you obviously don't know shit about the subject you're drawing/writing about, that you use a word too much in your work, that you suck at smoothly animating things, etc.
Last I checked you don't need to be an artist/professional working in the same medium in order to have an opinion and in order to see the mistakes and faults in your work. You don't need to be a chef in order to tell that a soup tastes like shit, now do you?
So don't use that excuse, as it has no backup in an argument besides this shit: "You don't know how hard it is!" But, even then, how do you know that I don't know that. Have you ever considered that's the reason that I don't draw it? Because I find it difficult? TL;DR Suck it up, put on your big girl panties and realize that everyone can critique your art whether you think they should or not. Critiquing exists for a reason.
Also, you don't need to be a premium member with a fancy tool to critique. Comments work the same, the critiquing tool is just fancier and easier (though there's a minimum word requirement).
Accepting critiques on this for the lulz.