1. They don't respect your career, and treat you solely as a resource. They have poor staffing practices (understaffed engagements, long working hours). They will ask you to skip trainings, vacations and would burden you with undue stress if you are marked as a critical resource for a project.
2. If you are on a traveling project, then they would expect you to be in office 8am-10pm, and always available if something comes up (even midnight)
3. You would hope that all those long hours will help you at least in a monetary way, but it will not. Work 13 hours, get paid for 8 only.
4. They will fire you if you do not meet your utilization targets, even if it is not something you could control. Culture of hiring and firing.
5. No one will care about your growth and career trajectory.