What you may not do on an eVisitor: work, and study beyond three months

Because the eVisitor is free of charge and granted quickly, people sometimes treat it as a light-touch permission to do whatever they like for 3 months. It is not. It is a visitor visa with conditions, and the conditions are enforced.

Work

You may not work for an Australian employer. Business visitor activities are a different thing from working: attending meetings, negotiating, or going to a conference is generally fine; being paid by an Australian business to do a job is not.

Remote work for an employer outside Australia

Working remotely for your existing employer overseas is a grey area that depends on the specifics, and it is not something a comparison site should rule on for you. If your trip depends on the answer, check with the Department of Home Affairs before you book.

Study

Study is capped at 3 months. A short course is fine; a semester is not. Longer study needs a student visa, applied for before you travel.

Why this matters more than it looks

Breaching a visa condition can lead to cancellation, removal, and an exclusion period of up to 3 years. The cost of getting this wrong is not the fine — it is being unable to return.

Source: Department of Home Affairs — eVisitor (subclass 651)