Seeking arrangement app

The app probably updated and needs to be re-added from your installed apps back to your home screen. Sometimes happens with apps.

not in app store

based upon their website, its been re-branded as just "Seeking", and only has the android app available.....

Seems like Apple deleted it

The app was pulled, you'll have to use the website from iphone. App still available on Android

Seems Apple is taking some kinda political stand

^ or maybe they're concerned about some possible liability whether legal or in the court of public opinion (#MeToo)

If it's Apple then it is more like #iToo

Apple has a long history of not allowing apps that specifically promote or enable sex and gambling.

I find the app to be restrictive and does not have the features on the website. I deleted it some time ago.