Sad to see Pocket shutting down. For anyone seeking alternatives, I've been working on Linkwarden[1], an open-source bookmark manager that hit HN's front page twice[2][3]. Plenty of other great alternatives out there too, such as Raindrop (not fully open-source), Karakeep, and Wallabag.
Also, there's an official Linkwarden mobile app in development, aiming to support most (if not all) of Pocket's key features :)