I am aware that this is an existing topic, but I can't find it

The purple has not been changed on several places on Scratch, including:
The highlight you get around a box when you drag a script to another sprite/the stage/your backpack.
The text editor symbols on the Scratch forums (this probably won't be changed. )
I do not understand why gradients default to blue, but this is probably intended
The default profile picture (it's slightly strange for it to be a different color, but it will never be changed, most likely. )
As said on another topic, the loading screen
Also has been mentioned before, but the tutorials are blue, and this may or may not have to be changed.