There is no limit to how much COMMISSION_FEE can be set. If the distributor contract is redeployed, the COMMISSION_FEE can be set to 10,000. Users will not receive any money in this case because the commission takes away all the rewards.
In Distributor.sol, the COMMISSION_FEE is set at 500. The comments state that it can be changed in the future, so it is assumed that if changed, the whole contract would be redeployed since there is no function to change the COMMISSION_FEE within the contract.
If the commission fee is set to 10,000, then no one would receive anything.
Winners will not receive any rewards since the commission takes away all the rewards.
Manual Review
Recommend adding the COMMISSION_FEE in the constructor and limit the commission fee to a max of 10%.
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