From November, 2022

"Activist investor TCI Fund Management is calling on Google's parent Alphabet to pursue aggressive cost cutting on the back of a hiring spree during the pandemic, claiming the business could be more efficiently run."

- https://www.theregister.com/2022/11/16/tci_fund_google_cut_c...

I would assume Google was no the only one to receive such a letter, nor were TCI Fund Management the only investment fund sending out such letters