I run a knots node, and that’s great. I can configure my defaults as I wish. The issue is core v30 exists and nodes running it comprise about 12% of the total nodes talking on the network at the moment, about 2,900 nodes.
These nodes, because of v30 updates, will ultimately be relaying transactions that could include large amounts of arbitrary (possibly illegal or malicious) data via OP_Return to one another’s mempools.
If these transactions get mined into a block, it will remain on-chain forever. Then every other node on the network will have to store that block (and its contents) as well. Doesn’t matter which node software or defaults you have for your node.
That is the most condensed way I could put it..It affects the entire network if large amounts of arbitrary data regularly finds its way onto the blockchain, which core v30 not only makes likely, but basically encourages. Who knows what data/spam will be used to exploit this, time will tell.
Unfortunately, the entire #bitcoin network is now vulnerable to an attack vector that never needed to exist.
