As was just pointed out to me, that means mail-order husbands are not forbidden. Just in case anybody was planning on starting a new business.... :)
In all seriousness, some of these other markets are massive industries, but are excluded for good reasons - I recognize a number of them immediately as being disproportionately high targets for fraud and/or chargebacks, which would be prohibitively expensive for Stripe to deal with right now.
