Hello - this is Matt, I am Pocket’s General Manager. @nukeador recently made me aware of this thread and I thought I’d chime in directly.
Pocket and our code existed before Mozilla and was not open source. Now that are a part of Mozilla we’ve been taking steps to open source. We’ve made some progress, but completely appreciate that the speed is not what some would like to see.
We’re still a small team and we do not have the bandwidth to spend full time effort on open sourcing our historical server code, but as we’ve developed new services we’ve been working on open sourcing. With the code we are open sourcing it’s more complicated than just adding a license and making the Github repo public. We need to conduct security audits, legal/IP audits, we need to review 10 years of code history, etc.
Last fall, we open sourced the Pocket proxy server code that we use to deliver sponsored content to Firefox New Tab.
Our progress this year has been slowed due to COVID-19 and the need to adjust our priorities.
That is the update for now, we will continue to release at github.com/Pocket as we go.