Could my ETA application be rejected?

Yes, if you have a criminal record or you have entered wrong information in your application form.
 You just need to be honest with your answers in the application form. The ETA is like any other visas; your travel to Australia depends on it.

Double-check your form before submitting it. Or ask someone else — somebody you trust to do it for you; e.g. a friend, your parents — to have it fact-checked before hitting Submit.

Could my ETA application be rejected?

Yes, if you have a criminal record or you have entered wrong information in your application form.
 You just need to be honest with your answers in the application form. The ETA is like any other visas; your travel to Australia depends on it.

Double-check your form before submitting it. Or ask someone else — somebody you trust to do it for you; e.g. a friend, your parents — to have it fact-checked before hitting Submit.

Get more information at https://blog.traveleta.com.au/how-to-an-invincible-eta-application on January 27, 2017