Well... BBT is not really theirs... in this case CBS is just the distributor and I believe the Warner Bros TV/Chuck Lorre Productions, much in the same way Star Trek never originally aired on CBS... it was owned by Desilu... distributed by NBC, and at some point CBS acquired Desilu. CBS also owns many other shows that they never originally aired... like Cheers and Frasier, and these are all available... HBO is the distributor and the producer of their shows... but they have plenty of of content they are only the distributor of... its the same model used by every service... Netflix, and Hulu included.
Exactly. There's a good chance Big Bang Theory will be taken off CBS All Access so it can be made available on WarnerMedia's upcoming streaming platform.
I suppose that's one more reason for the CBS-Viacom merger to happen soon. The more content, the better.