Hand pollination is a surprisingly common form of pollination in global commercial crop production, including for some economically important plants.
You can read this article online at https://www.botany.one/2021/09/when-looking-after-pollinators-is-literally-a-matter-of-self-interest/
You can read the original research at https://doi.org/10.1016/j.baae.2021.08.008