No, moderating forums is not immoral.
By participating in a moderated forum, you have traded your ability to post whatever you want in exchange of everyone else being bound by the same restriction.
If you don’t like it, you can go post in some unmoderated forum. If you can’t find one without spam or low quality posts, them’s the breaks kid if you want the wild west you get the wild west.
I wouldn’t rely on a technology solution entirely. I would pay multiple lawyers to send a specific file to different recipients in the case of my death. The file would contain the list of release mules and recipients.
If I had something worth my life.