You have a rebate cap of approximately $100, while referral commissions are uncapped. There is no limit to the number of people you can refer and so there is no limit to the amount of commissions you can receive.
Your rebate cap will be based on a reference currency in which rebates that you receive are calculated on the day of the underlying trade, based on the prevailing exchange rate. Once your rebate sums up to a cap in the reference currency, the cap will be activated and the rebate will stop.
Example:
You receive a rebate of 0.0001 BTC. That day the exchange rate between BTC and USDC is $50,000 per BTC. Therefore the contribution to your cap is $5.00 (0.0001 BTC x $50,000). The next day you do another trade and receive a rebate of 0.0009 BTC. The exchange rate has moved to $51,000 that day. Therefore the contribution of this trade to your cap is $45.9 (0.0009 BTC x $51,000). Your total rebate at this point is therefore $50.09 ($5.00 + $45.90). Once this total rebate has reached an approximate value of $100, your cap will have been reached.