@fuat2mb Personally, I like the idea of instances exclusive for testing out.

Also Mastodon allows the user to point to his/her new account, so migrating, for outsiders, doesn't too far fetched to implement elsewhere if desired. And Mastodon and Lemmy (at least) allow exporting the user's data, so also not reinventing the wheel there. And the idea of an instance made for testing out could be set up just like that, on an instance basis, so no need to change fundamental functionalities of a given forum engine.

Two things I'd propose, though, first to not allow new magazines/communities to be created by non-admin/moderators as to not have derelict ones once the allowed usage period ends, and to have some level of control on people subscribing to avoid bots.

And regarding the usage period, I wonder if a moderator bot could be set up to automatically lock a given account after it, only allowing to log in to get the aforementioned export data (if that is to be implemented).