You could take 100 orders for umbrellas, deliver 15 umbrellas, keep the money for the other 85 and disappear. That is a scam, even though you shipped something.
They haven't disappeared.
The scam BFL is accused of is misleading their investors into loaning BFL money in return for a small possibility of receiving a product in return.
There was no misleading. What did you think they were going to do with the pre-order money? Do you think all mining hardware companies are scams? They are all taking pre-orders.
Not sure if serious. But just in case you are not just being outrageously sarcastic...
BFL has not disappeared yet, but they have only delivered 15% of their backorders (less if you go by hashrate). Just like with BFL's FPGAs, they cannot deliver and are trying to convert the orders to the next generation of product for more money. That way, BFL gets another year, more cash and still don't have to deliver anything.
BFL assured their investors on multiple occasions that they were
NOT using the pre-order money to fund operations or development, that it was kept in separate accounts until the order had been shipped. Here is their latest message on that subject that I know of:
For the record, BFL is capable of refunding all of the preorders in the queue and remaining in business.
This has been their party line since Oct 2012.