I am taking opsec very seriously so even though the answers to these questions might seem obvious to me I'll say it out loud for the record

1.Where do you run this? Your home, or you use some provider?
I can't disclose the exact setup that we're running but there are >5 servers, all but one are from different providers. The last one is one of the signers and it's a physical server in a secure location that we have visual access to 24/7, so it can't be tampered with.

2.How much access does the site provider have?
The other providers besides the one where we run the clearnet server (which is public) should not even be aware that we are using them. Regardless even if they knew there is nothing they can do since no single server holds all keys. So noone besides me has access to anything unless they break into all servers at once without me noticing, including the physical server. I will also change all servers and rotate providers once in a while just to be sure.

3.What rights do they have? How much information do they have about you?
They have 0 information about me, same as everyone else. Worst they could do is shut down a server, and that really doesen't do anything since we can replace it in 10 minutes and have everything up and running again like it never happened.

4.Are you doing everything via anonymous networks?
Yes

If as an operator you can't even protect yourself, then there is no way you can protect your users and this is what this service is all about. I'm also willing to put my money where my mouth is, so if anyone can manage to find the IP of any of the signers (no time limit) I will offer a considerable bounty.

Correct