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Bitcoin. at the end of the day, Bitcoin's security does rest on people and people are flawed, so it's less interesting to address the flaw of being reliant on people. but I'd be curious to hear your case if that's where you want to take it.
Mempools aren't exactly packed, downloads for most of the cold storage apps number in the hundreds or thousands, not tens of thousands. Do you think self-custody will ever be widespread?
If a non-dev wants to contribute to bitcoin projects, what is most useful? Document review? Just using the software and writing about what it's like? Trying to help with advertising?