Unfortunately by sending DNT you are merely suggesting to the server that you wish to not be tracked. There’s no requirement for the server to actually care about you at all.
Now, if DNT were actually legally binding though - that would indeed be very cool.
Notepad++ works great for taking notes. Besides, it’s open 24/7 anyway so dedicating a tab or two (or dozen lol) feels pretty natural.
I only use Joplin if I have some “very structured” notes about some topic, and while that is also open 24/7 np++ is always my go-to because “it just works” without having to care at all about formatting nor anything fancy.
Doesn’t really sound like a company that I would want to do any business with then.