What would you name this marketing tactics (scam) where an Business institution themselves post question and then self promote?

sockpuppeting

"Sockpuppeting" is when false identities are created online in order to deceptively not appear as oneself online but as another or others to propagandize by asking questions and giving opinions, to create an illusion that many hold the same opinion, to hype online buzz (i.e., generate a greater appearance of interest than actually exists), and to spam.

In business marketing, one may engage in sockpuppeting positively for one's own business and products and/or negatively against competitors' businesses and products.

As a practice, sockpuppeting is unethical. Social media platforms generally ban sockpuppeting by way of the terms and conditions they require users to agree to in order to set up an account on their platforms. Sockpuppeting isn't generally illegal, though, at least not in the United States since expressing opinions is protected speech under the First Amendment, the only illegality being if one is sockpuppeting speech that isn't protected speech, like libelous claims.

This link describes "sockpuppeting" in a general sense: http://changingminds.org/techniques/propaganda/sockpuppeting.htm

This link describes "sockpuppeting" in a business marketing context: https://www.ozbargain.com.au/wiki/help:sockpuppeting

gambit, perhaps?

A gambit is an action or set of actions, which you carry out in order to try to gain an advantage in a situation or game.

He sees the proposal as more of a diplomatic gambit than a serious defense proposal.

[Collins]

Another one: marketing ploy

something that people who are selling a product use to make people want to buy the product

[Merriam-Webster]