Shilling by nation-level actors often involves paying South Asians or Africans to create profiles claiming to be an ordinary person from somewhere completely different. Or people in said countries may not even be paid by a geostrategic rival but are shilling because they identified profit potential in e.g. selling MAGA merchandise. Obvious what they do depends on pseudonymity, and would fall apart if their real names were shown.

With anonymity, they can 1000000x their presence and thus the effectiviness of their message.