I used and liked Pocket.
The main reason I stopped using it was that I found myself less often in offline spaces, which is when I used the reading part to catch up on interesting long articles.
Once planes, trains, countryside, foreign countries etc had good enough and/or cheap enough connectivity it mattered less to have offline reading material.
On the other side, competitors for those offline spots arose like Netflix letting you download episodes.
My dedicated ebook reader, which I had Pocket installed on, suffered similarly neglect. Phones got bigger and better enough.