I don't have a good answer to your questions, but they reminded me of a Minority Rule post that I never got around to writing.
Why is virtually all salt in the US (and likely many other places) kosher? The number of people who will make their purchasing decision on that factor is miniscule, but the cost of complying is sufficiently low to make it worthwhile.
Also, I think you're right to point out that not caring about custody is not static. If it becomes less costly or more beneficial, then more people will want it.
the cost of complying is sufficiently low
Perhaps this is the rub. Maybe what is easy to agree with in the tweet is that this is implied:
"almost no one" = # of people who benefit / cost of providing benefit
The number of people who benefit might be large, but the cost of providing the benefit is so much larger that it's best to treat the beneficiaries as if they don't exist.
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