They are a privacy nightmare and also trying to milk you for profit.

They have little to no incentive to find you a partner, they want you to keep using (and paying for) the app. They profile you, they sell all your data and to make things worse there are four(-ish) large companies running it all. They offer multiple apps and just combine all the data in large databases. I would argue they are worse than regular social media, given you share intimate details about you on these apps.

Also the lack of Arch-using cuties in my life. That problem might also be addressed.