I think this company has few different teams that work on the problem from different angles
Some are on the boats in the Pacific some are building interceptors in rivers in countries that are the largest producers of waste that makes it to the ocean. Of course they can't fix the problem just slow it down. The fix comes from these countries changing how they allow garbage to be collected and stored.
You don't have to if you don't want.
But whether you like it or no rich entertainers like Taylor Swift get lots of media and views. Which parleys into influence and bringing attention to a candidate or an idea.
This is the reason why anyone that wants to grow a brand and/or an idea will try to get a celebrity to endorse it.
Edit: This doesn't mean they know more than the average joe it's all about marketing