Thank you for the citation. I was thinking about discrimination more broadly and treating them as equivalent in a moral sense, as I think Cory has done in this post.
I’m okay with legal requirements for advertisements in critical cases like housing and employment. I see that the law is not limited to advertisements but includes notices and statements which sounds like it could describe anything put online. It’s one thing to have requirements for paid advertising on online platforms, even if they’ll mean having to have human review, you can’t have the same strictures for literally everything. Individuals are responsible for what they put online. When they do so on a platform, perhaps there could be something like the DMCA safe harbor provision that makes that clear; I don’t know if platforms could have a takedown procedure, they can’t be experts about every law in every jurisdiction an individual’s speech may violate.
I noticed age discrimination is not prohibited. That’s probably to allow for advertising of housing for senior citizens, but it could also mean advertising that’s only shown to people in their 20s would also be legal.
I’m on my phone so maybe I missed it, but usually such laws have exceptions for when the property is within one’s own home. Basically, you shouldn’t have to live with anyone you don’t want to even if your reasons are racist, sexist, etc. I don’t think anyone would say a woman who wants to sublet a second bedroom can’t say “women only.” A platform should likewise allow the individual to state or advertise their preference.