I kind of see what Derren is getting at. Bioware took parts of FR (Baldur's Gate, Neverwinter, Bhaal) and did the heavy lifting to make them popular. The face of TSR/WotC's FR at the time was Waterdeep, Icewind Dale, Cyric and Mystra. There's no question that Bioware built off a lot of TSR/WotC's work, and now WotC is building off Bioware's work.
To use a different example, consider Knights of the Old Republic. It's clearly based off Star Wars, but it's also it's own entity. If the next Star Wars movie came out in the KotoR time period and referenced Revan, it would be clear that Disney is building off Bioware's work.
However, I don't see anything wrong with that. Bioware expanded those universes with style, and I think it's great that the parent company would use those expansions.