BSL code automatically converts to open source at a specified date. So probably several releases since then are now as open source as anything else in the world. And if not, then they will be soon - BSL allows a maximum 5 year delay.
i don't care that much because i don't use it, and evidently not much of anybody else does either, or there would have been a popular fork. i'm just saying that this is probably not a good time to expect one to pop up
I'm also waiting for longnow.org to start using long dates behind the scenes, like image urls, html metadata, http headers, etc. They need to eat their own dog food as far as software goes.