Actually it’s called day one patches. Similar to zero day vulnerabilities (in the name sake only) these patches are usually required to play day 1 of the game…

example: https://www.gamedeveloper.com/business/why-you-should-want-d... (Only linking this article for it’s referencing them as day one patches)

another example: https://en.wikipedia.org/wiki/Glossary_of_video_game_terms#d...