The linux community took a little bit but was able to get the DRM stuff working through wine (I think it was firefox+silvervine or something)and I think they now have a native solution. I doubt there's any real reason you couldn't get it working, it's just the FreeBSD community is a lot smaller and you'll have to convince somebody to work on it unless you have the know-how to yourself.

Yes. It's getting somewhat out of date though (e.g. current versions of Steam can't connect to the network)

Out of curiosity: is it that FreeBSD has the old socketcall(2) but not the newer fine-grained system calls?

Possibly. I don't remember what it was, maybe it was actually some new arguments or something