I won't belabor the reasons that dating apps suck because most of them are highly knowable (though there are some edge cases, including mine as a nonbinary person, that have their own specific grievances) but I do think it's worth pointing out that although I know a lot of people who've used them (of various ages and sexualities), I don't know anyone who likes the experience of them
How bad of a product do you have to make as an industry for the entire userbase to regard it as an obstacle