Hahaha I take the point, I thought I was slick because I got the thread.dev domain and so didn't consider SEO as much. One of the alternate titles we considered was `Show HN: Thread.dev` instead of just `Show HN: Thread` to minimize overlap but last second opted against it. Anyways appreciate the feedback.
I don't think naming will hinder adoption of your product, but it will cause needless confusion for your (potential) users. Up to you whether you care or not, though!