Comment by Aachen

This is a concern for many developers, but I haven't heard of it actually happening when the software isn't crazy famous. Sorry to hear this. Wonder if it's rotten luck or actually a common problem :/

A middle way might be to do like some people and use a license that allows only viewing the code for some months/years and then allows all the normal software freedoms after that time. In the meantime, you get to work on it and keep yourself ahead of any copies that would need to work off of old versions, but if you get hit by a bus or for other reasons abandon it, it's automatically open sourced. I kinda like that mechanism because there's so much abandonware where it would have been really cool to have this. Though, if it's a serious concern that someone copies it like this, it might be a lot of pressure unless the source-available time is very long