If you had something to contribute to the discussion and then plug your project, then I'd say you're just plugging it. But you're not. You're just "appearing" in threads to plug you project. It's not a side-effect of your comment, it's the entirety of your comment. Hence "appear > plug" instead of just "plug".

And no, I'm not in charge of what's OK, just telling you that people are starting to see your constant, unrelated plugging as spam.

And yes, it is (currently) vaporware, no matter how long time it takes to build it. Why is it vaporware? You're advertising something that currently no one can use and their is no concrete information about it. When someone asks what it is, you ask them what they want. You don't even seem to know what the project you're building is yet.