how seized by FBI and they came back and they refund?
that's impossible!
Because it wasn't actually the servers that were taken, but rather just the domain, which is usually registered somewhere where the US have some sort of jurisdiction.
It's possible the servers were seized. That's what happened in the case of BTC-e -- they relaunched the site from backup servers. I hope we get some clarity on that. It'd be good to know for peace of mind whether customer logs are in the hands of the US government.
Whether or not the servers were seized, the funds should be safe if they took the right security precautions.
I'm wondering if there are any domains that are so to speak "unseizable". Apart from .onion ones, i don't think there are?
Since the DNS is highly centralized, they would be few and far between. Some country code top-level domains are probably unseizable by the US -- in uncooperative or sanctioned countries like Russia, Iran and North Korea.
For sure, anything on .com or .net can be seized very easily. Those TLDs are controlled by VeriSign, who always complies with the US government.