Well, we at Killerfish are consistently too optimistic on release dates. The reality is that development always takes longer than anticipated and especially if you have a small team that cannot afford to release a subpar product.
If you look at Uboot, the scope of their game has clearly grown by orders of magnitude since the initial kickstarter.
I also don't think anyone seriously tries to pull a 'bait and switch' - that is almost always the result of ambition being greater than the means to pull it off. STALKER was a good example of this.
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