Why would the physical location of the server matter with respect to people knowing what you are doing? I have no idear where googles servers are when I fire off a search for cute cats in boxes, yet I still know what it’s doing.
As for “without laws” google still follows European laws even if my search happens to be handled on an American or British machine. You obey the laws where you operate not where your server is located.
For companies who are already complying with laws in whatever jurisdiction I'd have to agree with what you are saying.
But if the economics in the future make sense on some level, I could see criminal enterprises interested in exploring things like this. If narco's are building/using submarines now, I could see them managing/tracking/monitoring a global logistics from their sunken data centers (they'll need to find other ways to power and transmit/receive, because I doubt they could just hook up their cables directly onshore anywhere, setting aside being an easy choke-point to cut access).
Maybe future narcos, illegal EU personal data miners/brokers, pirates or who else for whatever could be interested, esp if the fixed cost of operating stuff now/future > operating/ future sunken data centers and probability/cost of seizure now/future > probability/cost with future sunken datacenters?
As for “without laws” google still follows European laws even if my search happens to be handled on an American or British machine. You obey the laws where you operate not where your server is located.