They should make their own version of Testnet: they can mine as much as they want, they can spam as much as they want, they can hype as much as they want, and they're not bothering the rest of us. Let's call it an altcoin. How ironic would that be, if Runes complete the cycle all the way back to the first thing created to get money from gullible people?

Testnet fees are now higher than Bitcoin fees. I'd say that's a win!