As I wrote: It strengthens and enforces typical stereotypes which don't make life easier for the target demo.
It's a free world dude.
this app/site is a safe ("halal") place for a _self-selecting_ group to congregate. how can you possibly have an issue with that? the people who explicitly want to find a muslim spouse can use this site, the people who don't particularly care if their spouse is muslim will use some other one.
if you want to build that site (for people specifically trying to find a spouse instead of trying to have fun, but not explicitly for muslims), just do it and quit shitting on this site.