The Indian cricket board or BCCI made some new rules for the senior players after they didn’t do so well against Australia. These rules mean players can’t have their wives or girlfriends with them for long tours and can’t do photoshoots or promote products during a series or tour. Basically the board wants players to really focus on cricket.
Also the new rules say players should stay for the whole training sessions and really focus on practice. They need to show up for official team events too. The board thinks these changes will make the team work better together focus more and win more games they’re worried about how the team has been playing lately.
So these rules are all about trying to make the team play better. By stopping distractions and making players focus more on the team the BCCI hopes the team will do well. It seems like the board is trying to fix some things they thought were part of the problem when the team didn’t play very well against Australia.