Yup: seems it's a Blink thing. Chromium on Linux doesn't show the Photobucket banners.
for people reading along: Blink is the engine used by Vivaldi, Opera, Chrome, Chromium -- this means these browsers are likely to render web pages in the same way. Firefoix and Edge and Safari use different engines.
Safari actually uses Webkit, which is what Blink is forked from, so it might be interesting to see which way Safari swings.
Regardless, this will be a minor rendering issue - something that will likely change soon enough as Blink and Photobucket update their respective code down the line.
{OLD GEEK MOMENT: Oh wow, they really did name it Blink because of the old Blink tag... That's hilarious and somewhat horrifying.)