It's from general research from owning stock in different entertainment companies. There are trade shows to shop TV/streaming projects to different services (broadcasters, streaming services, and or DVD printers) and other trade shows for merchandise licensing IP (intellectual property). The large studios are always there. Licensing mostly occurs (a year or two, sometimes more) before the public sees it.
Movie studios and animation studios have done it for a long time. More recently (last couple of decades) comic book and video game companies have engaged in IP merchandise licensing. It virtually free money, if you can get it.
There is some Earthworm Jim merchandise for sale on Amazon, but I haven't seen any recent updates on the animated series. I still don't know where the series will appear.
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