Weird question but fun! Might have made some far off assumptions

First I’d assume that the online dating market from the U.S. is around 18-60 years (168 million people). I’d then segment by people who are part of a relationship or not. Let’s assume that 50% of people are in a relationship and 50% of people are not. That’s 84 million people per category. Let’s then assume that 60% of those single people have used dating apps and 20% of the people in relationships use dating apps. 

60% of 84 million is 50 million. Here I’d assume that on average on average 10% of people pay for dating apps. 

20% of 84 is 17 million. Here I’d assume that 20% of people pay for dating apps. Maybe because they want more privacy setting. I.e. extra marital affairs etc 

If we assume that on average the monthly dating cost is 10$ a month. We would have 

50 million x 0.1 x 10 x 12 = 5 million x 120 = 600 million

17 million x 0.2 x 10 x 12 = 3.4 million x 120 = 408 million 

1.08 billion dollars is the U.S. market for dating apps