It makes absolutely zero sense for Crucial to implement such a warranty restriction - This is already covered under the endurance portion of the warranty. Making a clause that ANY use of the SSD for mining automatically voids the warranty is like saying your car warranty is void if you use your car to get groceries.

Crucial quoted its own warranty falsely and then attempted to implement that change retroactively. That's certainly grounds for a class-action lawsuit. They were smart to back down from this.