The main characteristic of a successful malicious attack on bitcoin is to get the bitcoin users to do it not yourself. Remember the nonsense called "stress test" years ago? It wasn't just one silly company spamming the network. They got bitcoiners to spam too by funding loads of addresses with small amounts then publishing their private keys. The result was nodes that were flooded by double spends and the mempool that was flooded with spam transactions that didn't come from a single attacker.

That is the main principle that the Ordinals Attack is using too. It is not one entity that performs the attack but they have fooled loads of people to participate in it by creating the parallel scam market and the tools to perform the attack.

The principle is commonly used in color revolutions, which I dare say is what's been happening to Bitcoin.