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That's a good point about monetisation. I did wonder how they plan on making money, but to be honest, I didn't do much research on that topic.

I asked this question through their in product feedback form and got this response:

> Arc is currently free, and we'll always have some version of the product that is free. In the future, we'll charge for premium and team features.

I would suspect the easiest way would be the way Mozilla does.

Search engine kickbacks and clearly defined ads on the new tab/page links.