I don’t get how anyone could EVER enforce a law or agreement or rule that says something I wrote at home on my device on my time is theirs.
Check your employment terms. I'd wager the first step of that is seeing if you have a paper copy. I know I don't for all the places I've worked or acquisitions I've been through.
Something like an ALCU or Second Amendment Foundation that focused on nothing but that would be a nice-to-have. I think it overall destroys creativity in the industry.