I liked BSL because the code ~was~ proprietary for a time so someone couldn't duplicate my software I've worked so hard on, paywall it, and put me out of business. I'm a one-man development operation and a strong gust of wind could blow me over. I liked BSL because it naturally decayed into a permissive open source license automatically after a timeout. I'd get a head start but users could still use it and modify it from day one as long as they didn't charge money for it.