Kind of dealer you want to eschew. If he is that dishonest to actually take deposits on a hundred 2020's without having a chance in hell to get that many it is downright unethical. Unless there are idiots literally berating him to be on a wait list just in case the 99 before cancel --doubtful
I suppose it all depends on
HOW that deal is made.
IF the dealer is up front and tells the customer that they are already over their allotment and
IF the customer still wants to put down a deposit (refundable) to hold a spot on a wait list, then there's nothing wrong with that. It's above the board if everyone knows the reality of the situation when the deposit is taken. That way the customer knows up front it may not happen and they get their money back if it doesn't. While the customer may not be happy with not getting a 2020, at least everybody parts fiscally "undamaged" and the dealer retains the possibility of a future sale as they've demonstrated to the customer they are fair and honest to deal with.
If a customer puts down a deposit knowing the situation is nearly hopeless and that the deposit is stated as "non-refundable" should they not get a 2020 C8, then that's on the customer. That falls under the "can't fix stupid" and "the only thing about common sense is that it's not common" category....
But
IF the dealer is just taking deposits and assuring customers they will get a 2020 when they ship.....well, that's a problem. Despite being morally and ethically wrong, it's potentially actionable in court (civil or potentially, criminal) if the dealer is intending to keep those deposits should they not be able to "deliver the goods"....
The potential caveat (and a weak argument at that) is
IF the dealer reveals the deposit is "non-refundable" at the time it is taken, they may have somewhat of an "out" to being actioned for fraudulent practices. That might not hold up in a court if it can be proven they took the money knowing they would not be able to fill the contract the deposit creates.
Fun times and interesting to watch it all happen from the sidelines. Too much hype around this new 'Vette fro me to want to get anywhere near it. For purchasing purposes that is. GM is very carefully crafting an over hyped media circus in order to create a buying frenzy when the gate drops. I guess I can't blame them really, they're a corporation that sells vehicles. They need to make profit or they go under, so cleaver schemes to ensure sales is to be expected.
But heck, I wouldn't be a buyer if there wasn't this hype around the C8 release. Just too much money for (what would amount to for me) a "toy".....hell, 60G is too much for any car IMHO. Although...my 2016 F150 Lariat did list for almost 70G when we bought it (didn't pay anywhere near that though).