TLDR; Besides Bitchat, Jack Dorsey is funding a nonprofit called “and Other Stuff”, which funds and creates products based on Nostr. These Nostr-based apps include software like White Noise, an end-to-end encrypted messaging app.
Note that this nonprofit has also experimented with ActivityPub as well, meaning that Mastodon may also receive support indirectly in the future.
And I was finding myself the most generous man on earth after donating $40 last month to an open source project that I don’t even use. 
Nice to see big numbers backing up projects like this from time to time.
Non profits are definitely a step in the right direction for funding FOSS that just doesn’t have enough resources. It’s not perfect, as the non profit needs money to operate, and that can eat into how it builds FOSS (Mozilla, need I say more?).
I’d argue the next step is government backed FOSS to supplement non profit based FOSS. Sort of like how PBS/NPR (rip) offer free information services to the public, we could see something in a similar vain.
We already have government-backed FOSS: NLnet
Seems to me like people are obsessed with everything Jack Dorsey is involved in. Also, Dorsey seems obsessed with social media, something that I believe is the last thing that we need to see more of.
Dorsey is oddly obsessed with a form of techno-libertarianism 
He funded a lot of advocacy organizations like Freedom of the Press Foundation but is a passionate Bitcoin champion, hence his support of Nostr over Bluesky.
Personally, I think his heart is vaguely in the right direction but is completely aimed at fringe platforms that are mostly techno-libertarian echo chambers at best. I doubt any amount of money or vibe coding can bring Nostr to mainstream adoption
The cognitive dissonance I have with him is that it’s great he appears to believe in things you mentioned and is putting his money to prove it and yet we have Blusky which was supposed to a properly federated social media platform but is very similar to be what Twitter should have been without all the shitshow it turned into.