You are justified in asking that these questions be explicitly answered in an easy-to-find area of the site.

Currently, the About section says only that "Less Wrong is associated with the Future of Humanity Institute at Oxford University and the Singularity Institute, where Yudkowsky is a senior researcher. The site is hosted and maintained by Trike Apps."

Presumably whoever pays the bills can do what they wish with the site, but it would be good to have this explicitly spelled out.

As for your last question, "not even in your wildest dreams" is the obvious answer. You likely retain copyright for your own posts, but that is it.