That’s only outside their native range. In Mexico, where they’re from, they’re pollinated by the Melipona bee. Mexico is currently 3rd place in vanilla production at 6.5%, so you’re not wrong to say the majority of vanilla plants are pollinated by hand, but they do have a natural pollinator. In theory, you could introduce the Melipona bee to areas where Vanilla has been imported to cut down the labor time/costs.