alt Hacker NewsWell, if you open-source anything these days and it does make it big, you can be prepared for a flood of low-effort slop PRs that you must either review for free or stop accepting external contributions altogether, making it effectively closed-source. You can't choose to ignore the garbage, it will collide with your stuff, unless your stuff is small enough to avoid collisions (in which case no one will see it).
Zero-contribution open source doesn't at all make it closed source.
It delivers on the value of open source, that anyone using your software is permitted to make and distribute their own changes.
SQLite is an example of a project that is open source but closed contribution.