I am neither a US citizen nor have ever been in the US. I want to remotely work for US-based companies, and so I need work authorization. When I apply for I-765 online on USCIS, it requests me to provide my eligibility category. I am an undergraduate student in a STEM field for your information, but I am not sure what is my eligibility category. The dropdown menu displays only 7 options, but I don't think I belong to any of them.
I want to remotely work for US-based companies, and so I need work authorization.
You don't need US work authorization if you are not in the US when performing the work. You need work authorization in whatever country you will be present in when performing work.
Do you have permission from the company to work abroad? They will need to be set up to withhold the taxes of the country you will be working in.