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It was released as freeware back when by EA originally, which is what openRA relies on. Later the source was released under GPL[1] during the CNC remastered collection from EA.

[1]https://github.com/electronicarts/CnC_Remastered_Collection/...

Yes, but "Freeware" is not a license. Typically there is an EULA that tells you what you are allowed to do.

The OpenRA site is clear that the code is GPLv3 and the assets are used under the C&C Franchise Modding Guidelines.

https://www.openra.net/download/

https://www.ea.com/games/command-and-conquer/command-and-con...

Shareware software come with restrictions on redistribution, not use.

Does it? I thought it was vice versa.

I think you're right - it encouraged sharing, but usually limited functionality (use) unless you knew the secret code "TIASP1814" - sorry scorched earth 1.2, you didn't give me a free upgrade 20 years ago, and I've been holding that grudge forever.