Check out Techno Tim on YT, he does a ton of videos on self hosting along with other interesting tech projects. https://www.youtube.com/@TechnoTim

Ex Activision QA employee here - It does not get anything done faster, and it burns out the devs and QA alike so more mistakes are made. It’s always about hitting dates on time for shareholder profits, the C-suite people in charge do not give a shit about releasing a quality game.