Тащить на плечах; пристроиться; воспользоваться; за чей-то счет, и т. п.

“Russian hackers piggy-backed on an Iranian cyber-espionage operation to attack government and industry organizations in dozens of countries".
Merriam-Webster dictionary:
Have you ever wondered where the porcine part of piggyback comes from? Well, it's not from the pigs themselves. The adverb piggyback likely began as "a pick pack."
The first known use of 'piggyback' dates back to 1565.

“Russian hackers piggy-backed on an Iranian cyber-espionage operation to attack government and industry organizations in dozens of countries".
Merriam-Webster dictionary:
Have you ever wondered where the porcine part of piggyback comes from? Well, it's not from the pigs themselves. The adverb piggyback likely began as "a pick pack."
The first known use of 'piggyback' dates back to 1565.