Years ago I was very peripherally involved in a large project for which everyone in the trenches, so all the devs working on it, knew it could never work. Heck, even the sales guys could explain, with technical justification, why it wasn't going to work. But they were getting paid, and jobs weren't exactly readily available at the time, so they all slogged on until eventually it failed as predicted. AFAICT it was a frog-boiling thing, it was easier to stay, and keep getting paid until the money ran out, than to stick your neck out and point out that there was a problem.