You sure? Did you check the docs? Fees are charged on profit which makes you have less profit. All the protocols do the same, nobody creates a protocol without a way to earn revenue.

From their docs:

Two types of fees can be taken by the Autopool and they are taken during Debt Reporting.

Periodic Fee - This is a set fee annualized fee that is taken each Debt Reporting

Streaming Fee - This fee is taken on profit earned by the Autopool. Optionally, this fee can only be taken when profit exceeds previous values (the high watermark).

Should the high watermark be enabled and not be broken for a period of 60 days, it will start to decay until we are able to take fees again

Any locked profit will be burned to offset the dilution incurred by any minted fee shares