Not sure what you mean with your comment, but 'keeping yourself busy' should not be confused with procrastinate or simply passing time. Procrastination, passing time, doing nothing, and feeling bored should also deserve time on its own.
However, I would not call them projects.
Anyway, there may be a feeling of burning on, or burning out, when private projects start to feel like a todo list...
I meant this purpose in the sense that an activity brings joy, the purpose is pleasure.
Doing something while procrastinating may be enjoyable. But along with it often comes guilt - sooner or later. I had issues with procrastination and occasionally still do. Even though some outcomes of alternate activities may be good, projects should not have the purpose of procrastination.
Passing time is when you deliberately do not work on any project. I think projects can not have and should not have the sole purpose of passing time. If a project brings you joy, good, if not, the activity should not be called project.
However, I would not call them projects.
Anyway, there may be a feeling of burning on, or burning out, when private projects start to feel like a todo list...