Which of the following is not true about banner ads?

The statement "Google limits how much text you can put on a banner ad" is not true. While Google Ads has policies regarding ad content and quality, it does not impose a specific character or word limit on the text within a banner ad image itself. The effectiveness of a banner ad often benefits from concise messaging, but this is a best practice, not a strict Google limitation. Good banner ads are indeed essential for a display campaign's margin (profitability), as they directly influence click-through rates and conversions. Banner advertising offers significant creative freedom in terms of design, imagery, and messaging, allowing for diverse visual storytelling.