Has anyone ever modded Bethesda games? And by modding I don't mean "downloading plugins" but making those plugins and doing game development for free? Same sh*

Has anyone ever modded Bethesda games? And by modding I don't mean "downloading plugins" but making those plugins and doing game development for free? Same sh*t. Same drama and human nature. So much drama about IP and copyright and abandoned mods. Point out that the source code is open. "Feel free to implement something yourself, the documentation is available." Crickets.