Zero impact on the use of CREATE2 opcode.
The code on line 72 on KittyPool.sol uses the underlying token's symbol as salt to create a new vault. This vault creation method indicates the use of CREATE2. With the way the vault is created, the CREATE2 and its salt does not seem to bring any impact because each vault creation requires a different _token address.
No impact
Consider removing the salt when creating the vault
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