Obviously there is the possibility that the manufacturer may never
deliver the promised machines or they may very different in quality
and function than what was promised.
That's all pointed out on the GlowForge pre-order page
You are pre-ordering a product that has not yet been manufactured.
We've tried to accurately describe it, but we may make changes before
it's delivered. If that happens, we'll let you know. You can get a
complete refund, including shipping, at any time until the product is
shipped. By ordering you agree to our Privacy Policy and Terms &
Conditions
and in the TOS https://glowforge.com/order#tc , which goes into great detail on how when and you can get a refund, when they may or may not ship, what features may or may not be included, etc. And that fact that you can't sue them if something goes wrong; you are contractually committed to arbitration.
Once you pre-order and they accept your order - which would be as soon as your credit card clears - you and they are bound by the TOS.
My favorite part of the GlowForge TOS is how they are not responsible for product delays in case of "an act of God, terrorism, war, political insurgence, insurrection, riot, civil unrest, act of civil or military authority, uprising, earthquake, flood or any other natural or man-made eventuality outside of Glowforge’s control."
The bottom line is: buyer beware for crowdfunded pre-order products. Some just don't work out. Some do.
All pre-order startups and crowdfunded gigs will have (if they're smart) a full TOS like Glowforge that covers all the bases.
And until GlowForge actually commits fraud and rips people off by taking and keeping money for vapor products - which has happened in the past with crowd-sourced products - prosecution under various state and/or federal laws doesn't come into play.
And,
a related phenomenon is "order taking" in which a seller represents
themself as having something they do not, accepting money for it, then
using the money to go buy the product before shipping it to their
customer.
That's a different deal; they're not getting ready to manufacture or making you wait until they build a factory. Online sellers like eBay look out for that with their business sellers, but have no control over individuals. If you eventually get what you pay for, no law is broken.
You could almost say that Amazon.com works that way, or any online business that keeps a bare minimum of inventory in a warehouse and ships "just in time" to customers or drop ships from another business and location. They're selling what they don't have; but they get it and send it, and most times, you don't know the difference.