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4 Big Tech giants have plowed over $1 trillion into stock buybacks in 10 years — more than Tesla or Meta's entire market value
(markets.businessinsider.com)
This is a most excellent place for technology news and articles.
Your example would be manipulating for the company. Stock buybacks primarily manipulate for the execs and large shareholders. Even though they have reporting requirements, they benefit from the general increases in price.
If the company wants to give money to shareholders, they could do that in the form of dividends.
No one is being manipulated. The company is handing the stockholders their own profits. Dividends are the same thing, just taxed differently.