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Incentive to increase estimate might be:

Deliver under estimate and get a bonus, raise, influence, or just plain old "well done"

Be lazy and only work half the time while delivering "on time".

Only work on the project half the time, spending the other half on something more worthy/interesting.

>Only work on the project half the time, spending the other half on something more worthy/interesting.

This is actually a pretty common motivation for devs who work under legacy management.

And those who, thanks to WFH can handle two jobs at once.