Binance flexible savings tier (diminishing returns), what is the logic?

I don't understand the logic behind the tiers in the flexible savings.

For example, for USDT, if you are to put 2000 USDT or less, then the APY will be 10%, but for every USDT above 2000 (up until 75000), you only get an APY of 3% and for every USDT beyond that, you only get an APY of 1%.

I don't understand the incentive for the broker (?) to give diminishing returns. The only hypothesis I have is that it is some kind of incentive for the customer to start using flexible savings. Any insight?

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(?) New to investing, and I am not sure if I am using the right terminology.