Western Digital was the first "Sponsored Images".
(these are screenshots on my phone)
You don't have to click on it or anything. You get rewarded just to see this background image!
They even have this "Western Digital Ad Campaign" ad.
This is just a regular click Brave Ad, but when you click it, it will show you a form and ask you about the image campaign and to fill out the form.
I don't think you will get anything from this form, but this might help their image campaign or Brave "Sponsored Images" strategy? ¯\_(ツ)_/¯
Here are some details about "Brave Sponsored Images"
Like the existing images shown on the new tab page, these are full screen, immersive images. Each brand and each image is approved individually by Brave; and the format is limited to the large image and a small logo overlaid at the lower left.
Sponsored images are private. The ad acts more like a billboard than a typical digital ad — the sponsorship is the same for everyone in a given country.
Sponsored images appear by default in the image rotation, and are shown in every fourth new tab created. You can turn off sponsored images (or all background images) directly on the new tab page: