It's been a while now but once out of curiousity I tested the text to speech functionality (with my eyes closed) on an iPhone and another device (a laptop maybe?), and found iOS to be more advanced but still lacking. I don't know much about this but it's nice to see improvements. GrapheneOS seems to be a high value project in terms of dollars-to-output.
They accept more than 11 different payment methods[1] for donations and pay most of their devs in Monero.
[1] https://grapheneos.org/donate