> The button to the left of the 1 is the standard button on both EU and US keyboard layouts
It's very different on different standards and different languages of those standards. Mac UK and ISO UK are completely different, Mac US and ANSI are similar so I'm guessing you are using an ANSI layout.
> As a programmer, I'm using ~ daily
On UK ISO ~ is to the left of the return key i.e the majority of keyboards in the UK, not the 1 key (aha pun) which is where ANSI puts it.
The OPs keyboard is a Mac UK layout (most easily identifiable by the completely difference positions of @"\#~`), so the GP's comment is fairly accurate, weird mac squiggly thing indeed. They should really consider offering an ISO layout unless they are only targeting Mac users.
[0] https://en.wikipedia.org/wiki/Section_sign#Keyboard_entry
I have owned or been issued well over 8 macs and none of their keyboards had a section symbol.
I didn't notice all the missing important keys.
~ del pgup pgdown ins home end
And cmd and opt have no place in a Windows or Linux machine. There should be alt and windows/super there. Seeing cmd and opt constantly remembers the owners that they are using a keyboard for Macs. Maybe they'll build one for Windows and Linux if they'll be successful at selling this one.