The phrase "user base" refers to the group of individuals who regularly use a particular product, service, or platform. It basically represents the number of people who are actively engaged with a particular entity. Full definition
It boast of a large user base of younger men and older women. (datingwebsites101.com)
This tool helps you get aggregate and anonymous details on users based on your search criteria, making it easier to target your posts and advertising to reach that part of the market. (inc.com)
There's no point in downloading a dating app that doesn't have a large user base of lesbians, right? (datingadvice.com)