The world's best attackers are not motivated to crack those shitcoins. if I was a cracker who found a vulnerability in OP_CAT, i would push to get it added to Bitcoin so i could actually benefit from my work. 

 And it keeps looking like they’re trying. Udi from Taproot Wizards seems to be a big proponent of OP_CAT. I assume he wants to make bitcoin a shitcoin (“innovation”) paradise. 

https://www.coindesk.com/tech/2024/04/24/op-cat-proposal-to-bring-smart-contracts-to-bitcoin-finally-gets-a-bip-number/