343 Industries hinted Halo: The Master Chief Collection was getting MTX earlier this summer, but thankfully, those plans have been scrapped.
How Halo: The Master Chief Collection Rebounded To Become A Fan-Favorite Compilation - Game Informer
343 May Add Microtransactions To Halo: The Master Chief Collection
Xbox: 343 will continue to work on Halo, but other studios may get involved
Halo 4 PC review: Satisfying conclusion to the Master Chief Collection - Neowin
343 Industries - Page 3
Halo: The Master Chief Collection
Halo: The Master Chief Collection
Halo: The Master Chief Collection devs exploring microtransaction options
Halo Infinite Dev 343 Explains Shop Price Hike, 'This Isn't Necessarily What Everyone Wants to Hear' - IGN
Halo: The Master Chief Collection
Halo: The Master Chief Collection Microtransaction Plans Abandoned
Halo: The Master Chief Collection may get microtransactions in future : r/pcgaming
Game Informer's Halo-Centric May Issue Reveals Cortana's New Look - GameRevolution
Another Xbox Franchise is Getting The Halo: MCC Treatment - Rumor