Well, I would start with the 13 schools that required it for you. They use it in their admissions decisions.
As for how badly it will hurt your chances, let me give you the definitive, absolute answer: it doesn't matter. You have the score in, you have your application in, there is nothing you can do to change it. Sorry worrying about does nothing but take away from your mental and emotional resources that would be better applied to writing and polishing secondaries. move on
One small quibble. It's newish thing whose claim to fame is that it is a non-cognitive metric that supposedly increases diversity while positively correlating to some really awesome stuff.
Nobody really knows whether or not this is true. All we do know is that the company that developed, administers and pitches it across the Northern border is so confident in its objective validity that they are afraid to release scores (and, until this year, even quartiles) because the test will apparently be so easy to deconstruct and game if only we knew how it was scored. Pretty awesome, huh?

The Canadians swear by it, but then again, they have a dollar that's only worth 79 cents!
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Consequently, while the natural first reaction would be to say it must be important if the school is requiring it, that's really not necessarily the case. After all, if they are just using us to collect data to test the vendor's claims, they wouldn't come out and admit that to us, now would they?
This is really what OP is getting at, and unfortunately for him, no, no such list of schools that do (or don't) use it in admissions exists. There are probably some that don't use it, but they are certainly not going to admit that to us after forcing us to subject ourselves to it. After all, if we knew that was the case, we'd all half-*** it and ruin their data collection effort.
Other than that, you are, as usual, 1,000,000% correct. It doesn't matter. It's done. And whatever it is, it is.