Boy, the lack of self-awareness in this response is something.
Semi-annual PSA: Pocket was supposed to have been open sourced when Mozilla bought them out. Spoiler alert: it isn't. On the other hand, maybe we should give the parties involved the benefit of the doubt. These things take time, after all—the change in ownership was only announced in 2017.
(Perhaps the person you're responding to has a perspective on tardiness that has been influenced by Mozilla Corporation's relationship with the concept.)