There have been a number of failed Bitcoin miner asics basically as a result of designers using the tools without really understanding the tool's assumptions (o

There have been a number of failed Bitcoin miner asics basically as a result of designers using the tools without really understanding the tool's assumptions (or without themselves understanding the work the circuit would be doing). E.g. assuming that the toggle rate for gates would be much much less than 50%, and as a result the actual part used so much more power than expected that it wasn't viable (couldn't cool it or couldn't get enough juice into the chip).