You can hardly call it an ad as they aren't trying to sell anything, it is a mix of security awareness (how to spot a scam) and a competition to win a chromebook.
Now I won't be entering as I have no need for a chromebook and generally I can spot a scam from a long distance. But there are some who might well be happy to have a chromebook and or benefit from how to spot a scam.
For those that aren't interested, just let the toaster popup close.
Note: Using the show last pop-up won't work as it will show the avast update notification screen, you have to capture it fast before it closes.