What will happen if someone DDoS attacks Layer-2 Rollups?

Yesterday Solana got ddos (? not sure) attack. WuBlockchain says Solana went down for 4 hours. While recently Polygon got spam (attack?) from SunFlower Farm. Polygon's gas price has increased by more than 10x

What if these attacks happen on L2 like Arbitrum, Zksync, or Starkware?

Will the sequencer fails? Will the gas fees goes down/up?