Pkarr was used by 2 external teams before it was used internally in pubky, in fact before the name pubky was chosen.

Good ideas don't need much advertisement, but they definitely deserve advocacy. If you know you have a good idea, reach out to smart people and tell them about it. 

I get paid whether or not I talk about my work here... I just enjoy talking about it for anyone who would listen. 

If you don't want people to hear about your work, work on something different.