probably wise to continue in this thread, away from Mandalorian spoilers.
Good idea. In which case, I'll re-post this link to
Disney's contact page. If you scroll down a bit, you'll find an option for their "Corporate Social Responsibility" team, which I'd encourage people to use to let Mickey and his friends know what you think of this behaviour.
I think it's worth mentioning that this subject gets touched on for a few minutes early-ish in this
entertaining but spoiler-filled podcast discussion of S2E04 between Dan Moren and Antony Johnston. Johnston specifically notes that the SFWA wouldn't have taken up the case and come out swinging for Foster in quite the way they have if Foster's contract didn't have a watertight royalty clause.*
Bottom line: this sounds like Disney cynically looking to break a contract and relying on the fact that they can make any legal action so ruinously expensive that Foster wouldn't be able to pursue it and/or so protracted that he dies before it gets resolved.
*Not all royalties are royalties. Sometimes a company will make
ex gratia payments on WFH beyond the stipulations of the original contract but these have no legal force (I was once assured, for example, by an editor at a company that rhymes with
Lames Jerkshop, that such a thing might be forthcoming for further exploitations of a WFH job, but not one penny ever materialised). It appears that this isn't the case in Foster's contract.