There are several reasons why developers and teams have laid off their crypto projects. The possibilities are:
1. They are scammers (this is the worst)
2. They have no strong intention of making the project a success.
3. They are under-funded or have no enough funds to continue the project
4. They did not reach the minimum total they should have sold
5. They just want to make a project but they don't develop it well, so their project stalled
6. They know their project is likely to fail for some reason so it's better to back off at the beginning rather than continue and just make a loss
7. they just want to raise money regardless of the fate of their investors