shill
/ʃɪl/Definitions
1. noun
A person who secretly advertises or recommends a product or service, especially in exchange for payment or other benefits.
“The movie was criticized for hiring actors to act as paid shills in the audience.”
2. verb
To advertise or promote a product or service in a way that is considered deceptive or insincere.
“The company was accused of shilling their new product on social media.”