Transaction costs were included in the calculation. This scenario outlines a buy and hold strategy for BTC and ETH, so no short term capital gains taxes. BTC and ETH are not deflationary, so they do not have those mechanisms.

All of those would apply if you're trying to day trade a newer de-fi token. But what I outlined in the OP was the most milquetoast way to invest in crypto. Just buy and hold Bitcoin or Ethereum for the long run.