If Ruffles has a heimishe hechsher (I’ve never seen it), then they make sure it’s bishul Yisroel. Some poskim require it for potato chips.
Some salad mixes have a KAJ sticker on them. They are more stringent in the standards for cleaning and inspecting for insects.
Some cereals also involve bishul Yisroel issues.
I don’t know whether Twizzlers involves any change, or it’s simply a marketing tool. Either way, it’s valid, because some people simply do not automatically accept the national hechsherim, because they are meikil on certain halachos which some heimishe hechsherim are machmir on, and its easier to buy items with a hechsher which keeps one’s personal standards than to do research on every product.
The purpose, believe it or not, is not to make you, ZD, pay more. You can still buy your Twizzlers in Walmart if you want. Nobody’s stopping you. I buy mine in Costco, but it doesn’t bother me in the slightest if my local kosher supermarket carries Twizzlers with a shtreimel on it.