This strategy works better with altcoin blockchains with cheaper transaction fee but surely it does not include Ethereum blockchain.
Who cares about some shitcoin blockchain LOL. I think I have never deposited any shitcoin other than bitcoin ever in any platform.
Bitcoin transactions are not always cheap. When the mempool is full and piled with transactions then sometimes you need to pay even 50 to 100 sat/vB. Depending on the number of input and output address it can become two figure amount too. But for me I feel safe as long as anything that I have left or won is in my own wallet.