My plan is to give the software away for free, but keep the distribution somewhat centralized and the source closed. The app is, on a business level, a marketing tool for my Radio Silence firewall. I hope it will drive traffic and links to the site by giving away a complementary product for free.
Sharing the source through github might work against that goal.
The open source approach surely has its benefits. However, I think/guess/believe the free closed-source app has more direct effects on my visitor traffic. Open sourcing the software would probably help me build some kind of personal branding, but it's not a goal I'm actively working for right now. Currently, my priority is to get radiosilenceapp.com more visibility and authority.