Ubisoft's Year 5 season pass for Rainbow Six Siege leaked on Reddit which caused the players to start up a conversation on the features. They also noticed it will feature only six operators which prompted the developers to come in and explain the reasons.
Rainbow Six Siege normally introduces eight operators each year, across four seasons. However, Year 5 will contain only six operators which was revealed via a Reddit thread that had a screenshot of the features for those who purchase the pass.
Players noticed this immediately and started asking questions, which prompted a Ubisoft employee to the words of their game directory, Leroy Athanassoff. According to that statement, the team is investing resources on "building more features and systems that will impact every player in every match" as opposed to just those who play the new operators or matches where they are picked.
Ubisoft remained somewhat cryptic about what these features will be but the closest to an explanation was a statement that the change will "lead to additional content for all players, such as free events, extensive reworks, and other gameplay features".
This is not entirely a bad idea since became pretty obvious in some cases and reworks are necessary. Lord 'Chanka is probably the best example. Furthermore, the threshold of 50 operators has already been crossed and it remains to be seen how much the creative teams can keep pushing with new ones.
The explanation did not convince some players, however, with them calling it an attempt to squeeze out more money out of them. Considering Rainbow Six Siege is a paid game with season passes, microtransactions, loot boxes and a ton of different editions, it's not really unexpected some are growing disillusioned with the monetisation.