I am going to remove the Omnivore article action with the next feature update to Unread. Omnivore is a read later service that shut down late last year.
Omnivore is open source, and customers can run it on their own servers even though the service has shut down. I kept the article action in place for the benefit of customers who may have been doing just that, using a custom Omnivore URL. But I also added analytics to determine how many customers had enabled Omnivore with a custom Omnivore URL. It appears that no customer is using Unread with a custom Omnivore URL. Therefore I am going to remove the Omnivore article action with the next feature update.