Do you mean, those who want to profit from transaction costs deliberately forged many tokens on Uniswap, intentionally increasing the transaction volume in order to increase transaction costs in the Ethereum network? I think if those miners/forgers have enough potential, they can wave the market for a real coin/token like DeFi tokens to make a profit instead of wanting a small amount of transaction costs.
The existence of fake tokens on Uniswap is real since this is DEX, but I don't think it has as much impact on transaction cost price as the DeFi wave.