"fun" in quotes. The tooling around a project may be fun, in the same way that junk food is delicious. But ultimately, it delivers almost no value to you. I think the reason so many hobbyists do this, me included, is that there's no _need_ to generate value from your hobby, and thus, no incentive to push for the actual project completion!

A business that does this same thing will soon bankrupt (or swallow more VC funding!)