I can understand the reason for the increased growth of USDC because the coinbase relied on ETFs, which means more trust in coinbase, but the reason for the growth of FDUSD may be because it is in the beginning and it is supported by Binance.
Since these coins are printed at a ratio of 1:1, and with an increase in supply, they are burned, it is a reflection of the increase in demand in the current period, and the trading volumes for stablecoins mean trust in them and not a real increase.