OP isn't explicit about it but he's effectively F.I.R.E'd. These are projects to keep the mind fresh in what is early retirement. If that weren't the case building an actual business requires a lot more time, energy, resources even as a solo founder than what I'm getting from the blog post.
Or OP could be T.I.R.E.D. :)
He’s doing his best to bootstrap his multiple products, but is prioritizing intellectual curiosity, building neat things while not burning out.
At least, that’s my view of it.
