It seems like Lightbend have decided themselves to redefine what "Open Source" means for them, a slight warning sign of whats to come. > Sadly, open source is prone to the infamous “Tragedy of the commons”, [...] This situation is not sustainable and one in which everyone eventually loses. > So what does sustainable open source look like? I believe it’s where everyone—users and developers—contributes and are in it to…
I think they clearly state that the fresh versions are not open source, they are "source available". After 3 years since release the code automatically gets relicensed under Apache 2.0 and becomes open source. This is a nice provision that prevents the code from being completely lost if the company loses interest in it.
I've seen companies claiming "but you can use our buggy unsecure code after 3 years" but reality I'm yet to see actually anyone using this with BSL software.