Maybe the correct response to unconstitutional, secret warrants is to refuse to comply, maybe even refuse to respond? It's not clear to me what would happen next but I can't imagine Pichai would be arrested. Maybe a datacenter would be raided (could FBI even guess where this data might be physically located?) but at least then some public action would have to happen and break the secrecy.
Ummmm, no. Correct response is courts and then comply. Pichai would lose his job in a minute.