https://twitter.com/GrapheneOS/status/1578784771882516480
We're planning on adding Lightning donations with our own Bitcoin + Lightning node. It hasn't happened yet because there are so many choices to make and we need to make sure we have proper backups and automation to avoid ending up with a lot of money sitting in a hot wallet.
It's planned, but not there yet. Thank you for your interest in donating to the project, though. It's much appreciated!