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Did you configure --auto-liquidity?
The default requested liquidity amount is 2m sat, configurable with --auto-liquidity. The higher the amount, the higher the upfront cost, but the lower the mining fees in relative terms.
If you did not, this means it will open a channel with 2m sats inbound liquidity once you have enough fee credits to pay 1% + mining fees (around 21k sats).
I think estimateliquidityfees is giving you the fee if you would configure --auto-liquidity with that amount. But not sure why it's giving you a service fee of ~1k sats for 5k sats, it should be 1%. Maybe I'm wrong.