they don't want anyone to stake to them and just run own node with own inj staked?
It means they charge a 0%, 2%, 5%, 7% or x% of commission if you stake with them. If its (example) 5% that means that the validator will take 5% of your staking rewards as a commission. If you earn 1INJ/day from staking rewards you are going to get 0.95INJ/day and the validator will get 0.05INJ/day from your delegation.
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