Slowly and with enormous difficulty. The Core argument is that it's impossible and so we should mitigate spam and make it less destructive, which is a valid argument. The Knots argument is it is possible to reduce by filtering, it is extremely unlikely that it can be eliminated, but we'll never know unless we try. In terms of how we technically achieve this, this is a glimmer of hope: View quoted note →

That didn't answer my question on how it is technically achieved. Ocean and DATUM have nothing to do with it, though they're great for mining decentralization.