As per some legal stuff, the server is a VPS hosted in Germany and generally you should respect the law, if you want to post here. I'd also strongly advise you to follow the established set of rules on the general Mastodon "fediverse", whatever that is at the moment. Something like this I assume.
Security and privacy: on the best effort basis. As in, I'll try not to break it, but that's all you can expect.
Oh, and the most important thing: no history permanency, I seriously plan to do regular cleanups and possibly, when I figure it out, just delete everything older than few weeks. Life is moving fast and history is of no interest to anyone. You can't really even access it.