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Because its a hydraulic oil therefore will not damage a hydraulic system.
Unless it does / doesn't contain any any one of a number of additives that would break / enable a fork to do it's job.
By your logic why not put jack oil (or even fork oil) in an engine? After all it's just a hydraulic pump and some bushings? Why not put EP90 in your BSA gearbox? It's gear oil after all? The reason you don't (shouldn't?) is that EP90 can have additives that attack yellow metals (e.g synchro rings), but then not all EP90 does (GL4 less likely than GL5 but even that isn't set in stone). There's dozens of reasons why the wrong additives or no additives would cause issues in a system.
It MIGHT work, in the same way I MIGHT not break a leg jumping out of a window. It might even depend on the specific fork and window! But with the ludicrous prices of forks these days why would you use something that even with a modicum of knowledge about oils and additives could be very wrong?
Remember when I said I was no expert, but knew when to get better advice? ☝️
Very good TINAS.
Motorex who have the expertise and facilities to blend and package a fork oil may well make the Fox stuff, doesn't necessarily follow that it's exactly the same stuff.
In this case, it definitely is the same stuff. Same with the silkolene.