Llama-2 code appears to be about the same as gpt-2.
BFL mined with customer hardware and basically didn't ship units to customers until there was no profit in running one.
Crypto ASICs are a super weird edge case IMHO in chips, strictly speaking it's not rational to sell them if they are very profitable. It only makes sense if the customer has a different risk profile than you; or the customer can somehow get power more cheaply than you; or you have some kind of scam going on; or you couldn't get capital except by presales and are unusually honest.
Note that an additional profit-making option for crypto ASIC producers is to secretly over-produce and compete with your customers and you are unlikely to get caught doing this.