For that purpose, they’re linked with certain research companies. (Websites/apps in our case) These research companies engage their audience/users to do focused group discussion about a product of their interest.
They do so as they get paid by the business owners. And they’ll pay you as well, if you’re part of any group they’ve published on their website.
So, you get the money for talking about anything you’re interested in.
This website can give you an opportunity to join a focus group from anywhere around the US.
Studies are scheduled over webcam or phone call, but you have to pass a “screener” survey initially.
You can get into discussions about anything such as tech, food, family, software, transportation, beauty, social media or anything you can name, UserInterview will have a space for your interest.