> It is weird that they didn't open source the Remastered edition which already includes two modernised games that I assume use either new technology in place of deprecated versions, or just newer versions of those.
Part of the "value add," I'd think. The source code for the original games are released if you really want to play the old-and-creaky version from your youth, exactly as you remember it, ported onto a Raspberry Pi or whatever. But if you want the modern, "batteries included" remaster, you'll pay for it.
EA being, well, EA, you have to assume someone made the calculated decision that any unofficial port derived from the original source would be a sufficiently "degraded" experience compared to their Remasters so as not to be a financial threat. But perhaps releasing the actual Remastered source would have been.