Unfortunately if the answer needs to be open source, there is a large problem. You need petabytes of data, (not sure what comes after petabytes) to index everything. Only large organizations can do that, regardless of their motives or government control.
Unfortunately if the answer needs to be open source, there is a large problem. You need petabytes of data, (not sure what comes after petabytes) to index everything. Only large organizations can do that, regardless of their motives or government control.