If there were multiple designers using a common standard, you wouldn't be able to differentiate that though.
So it's a bit of a moot point, I suppose.
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No not really, the point is, there aren't, nor have there ever been, any other designers as you would like to call them.
1) Who was the Original Designer, which set what would be called, THE STANDARD?........GOD!
2) Who are these other designers you say are using (A Common Standard)?
3) Without the identification of these other supposed designers, which are using a Common Standard, the whole question falls apart, because we all know who it was that Designed (Created) the Original Code, but without the names of these other designers, the question becomes Assumption, Supposition, Conjecture, I'm sorry, it seems as though I am describing Evolution.
Just because someone produces an Original Code, it does not necessarily follow, that it becomes a Common Standard for all to use,.....even, if there were others to use it.
In Law someone cannot use or reproduce an Original Code as their own, that would be called Counterfeiting.
To clarify the point.
A DESIGNER
1) Is a person who devises or executes designs, especially one who
CREATES forms, structures, and patterns, as for works of art or machines.
2) Designed or
CREATED by or carrying a label or identification of a designer,
© 2017 Dictionary.com, LLC.
Notice I gave credit for the Definitions, otherwise that would be Plagiarism, see what I mean?