The gist of why knots and why BIP 444 to start making it a habit to always fight spam and fight it early, because publishing spam is a cost to spammers and to deny them their (scam) business model, mean they will sit on their costs instead of making profits from it.
But if spam will cause net losses for spammers, they will not even try to spam in the first place and thus the bitcoin chain gets rid of spam, which is great.
Let's all join this "whack a mole" game to proof to scammers trying to spam means making losses to stop them from even trying in the future.
https://www.youtube.com/watch?v=5iUVWBr0a2U