Do I lose my rights if I post something here?

No, you own what you wrote. All you do is give OAOA non-exclusive rights to publish it. Otherwise there’s nothing to read here. Thanks for sharing with us.

We won’t sell your works; that’s for you to do if that’s your thing.

Since you own what you wrote, if the constabulary come knocking over something you wrote, we’ll be sending them your way. Jeez, what were you thinking?