Like dating apps felt super popular around 2015-2018 and during covid but since then it seems less and less people are using them?

in my country bumble/hinge are completely done

on tinder in my french town of 370k people, there is like 150 girls between the age of 18-23 in the stack, half of them are obese, which mean that less than 1% of girls are using tinder

why such a huge decline ?