Very niche audience no? Don’t think those launch stats on these platforms indicate failure of your actual product.

yeh super super niche, only wip.co users, spread the word. I'm solely posting on wip.co, it's great!

Technically I like your product, but as a user I will not use it.
Personally I use wip different from twitter. I value the close-nit community of wip and do no want to post the things from wip to twitter, because it does not feel right. Otherwise I also think its ultra niche and you would kind only want to launch it on wip, because everywhere else you do not know if the user is on wip. or not.
Just my 5 cents :)