"This isn't making us any money, it's costing us money to maintain. If you still depend on it, here's the tools that will allow you to continue to depend on it"
It's one thing to say it should be open sourced but to put further effort into something that's already losing you money just for the love of it doesn't seem like a winning proposition.
"The biggest factor is that we have recurring costs: the sync server and the licensing fees for Ideal Sans, Vesper’s typeface."
They'd need to continue paying for their font license.
What I was thinking about was opening sourcing the app. If we do that, we'll have to replace Ideal Sans with another font. The obvious choice would be iOS's system font.