As stated in the first sentence POG stands for “Protect Our Games”. For a quick overview of the bills content I’m just going to quote Wikipedia (emphasis by me):

In February 2026, the Protect Our Games Act was introduced. Initially proposed by California State Assembly member Chris Ward in February of that year, the bill would require publishers to inform consumers 60 days in advance about a game ending support and to provide clear information about the game’s functionality after its end-of-life. The bill would also prohibit companies from selling a game two months before their discontinuation and require them to provide either a patch for the game to function independently of the publisher’s servers, a separate version of the game that operates autonomously in the same vein or a full product return.

en.wikipedia.org/wiki/Stop_Killing_Games#Protect_…

TLDR: it’s a bill that would, if implemented, mandate the things Stop Killing Games wants.