This is not true. There are a large number of contractors working at Google, Facebook and other companies in engineering and other skilled roles. Their contracts are from 3 to 6 months long.
If you're in a bind and need a job, you get placed quickly by one of the firms supplying contractors to the large companies. Since you're in a bind, you accept making a lower salary, which ends up being around 60-75% of the base salary of a full-time employee without any of the other benefits of being full-time.
If you're in a bind and need a job, you get placed quickly by one of the firms supplying contractors to the large companies. Since you're in a bind, you accept making a lower salary, which ends up being around 60-75% of the base salary of a full-time employee without any of the other benefits of being full-time.