If you have an economic fee is like 1 or 2 sat/vbyte, the extra fee from Trusted coin will be small fee.
If the economic fee is 30 sat/vbyte of 100 sat/vbyte, when mempools congest, the extra fee from Trusted coin will be no longer small, but it will become bigger and more expensive.
Trustedcoin charge a fixed fee and that doesn't depend on the fee rate and how congested the network is.
You can either 0.0005 BTC for 20 transactions or 0.00125 BTC for 100 transactions.