Apple used to also interoperate wonderfully if you were using Samba SERVER side too because - well, they were using Samba client side. Those days were fantastic frankly. You would run Samba server side (on Linux), then Mac client side - and still have your windows machines kind of on -network (for accounting etc) too.
But the Samba folks are (or were) VERY hard core GPLv3 folks - so writing was on the wall.
GPLv3 shifted things really from preserving developer freedom for OTHERs to do what they wanted with the code, to requiring YOU to do stuff in various ways which was a big shift. I'd assumed that (under GPLv2) there would be natural convergences, but GPLv3 really blew that apart and we've had a bit of a license fracturing relatively.
AGPLv3 has also been a bit weaponized to do a sort of fake open source where you can only really use the software if you pay for a commercial license.
