Don't believe the FUD; the ToS are not in conflict with FTC regulations.

HashFast paid lawyers specializing in that sort of thing to write their ToS in accordance with all applicable laws, rules, regulations, etc.

There is no "right to cancel an order before the guaranteed delivery date" nor is there any FTC regulation creating one ex nihilo.

When You Must Cancel an Order

You must cancel an order and provide a prompt refund when:

    the customer exercises any option to cancel before you ship the merchandise;