If Hashfast are trying to scam, here's what they would do:
1. Put miners on sale. State delivery in Oct.
2. Collect BTC and store them away
3. Delay delay delay delay. Don't ship a single miner... ever.
4. Refund everyone back via USD in January/Feb (tos now stats refund made in usd only)
5. Wait few months for the dust to settle and then sell all the coins that have been stashed slowlyyyyyy.
6. Congrats. You're now multi billionaire.
7. Buy 6 mansions, 2 yachts, 1 Ferrari for every staff member, buy Mexico and retire.
Bonus step. Use the chips to mine more coins. Alternatively, destroy them.
The problem is, changing the TOS after the sale has been made is ineffective against anyone who bought before the change. They can try as hard as they like to say "here's your $X, that's what you're entitled to under the new terms", but they can also be dragged into court and made to pay out the BTC they received or an equivalent value in today's market.
There is no real question that you could get such relief out of a court, only the difficulty of explaining the situation sufficiently to get what you're entitled to.
If HashFast is really going to try that, they've bought themselves nothing but a lawsuit that they're all but guaranteed to lose.
That said, even talking to a lawyer about it now is premature, because they haven't failed to deliver and the listed date for delivery hasn't passed. There is no case yet. As soon as they fail to deliver, and refuse to refund BTC purchases in BTC, I'll be out hunting down a lawyer... but until then there's no point to it.
