'Major' is up to personal definition and will distract people here no doubt. Metafiter has been my long-time lighthouse for this kind of gauge, though obviously not as big as its peak.

https://www.metafilter.com/newuser.mefi

- Anyone can view the site and its content

- Very clearly putting their rules of the road up (link above) before you can 'join'

- Commenting/posting/membership is a $5, one time fee

- A one-week wait before you can post

- Paid moderation

And it works.