I see your bullshit and raise you horse manure. Speaking from an administrative point out view, it is indeed harder to run a program like that spread out over a much larger area with a much larger population to deal with. A complication in the US is also in differing state laws. This probably wouldn't work EU-wide either.
Also Finland didn't start from a large pool of homeless people due to mental illness or medical bankruptcies because there were other social safety nets spun before this one to catch a lot of the people before they became homeless.
Blame the US for not trying. I do too. But "economies of scale" are not going to help a program that for it to run well cannot be run like a business.
"Killer feature" is silicon-valley-invrstor-ROI-speak. The fediverse is designed in opposition to central platforms funded by investors looking to make a profit.
I don't want to go back to reddit because they abandoned third party clients and made another few decisions that made me mad. Lemmy today is - objectively speaking - worse than reddit was circa 5-7 years ago. The user numbers aren't the same, the way the fediverse is connected reactions aren't as snappy and the search function is way worse. If I judged this on "killer features" I might be tempted to go back to reddit. I tolerate the shortcomings because I believe centrally operated platforms have a high tendency to enshitify as soon as they realize they need to make money.