https://www.gamespot.com/articles/battlefield-1-still-adding-new-content-but-monthly/1100-6458444/

It's now been a year and a half since Battlefield 1's launch, and since then, DICE has released numerous DLC packs and content updates. DICE has revealed that there are still a few updates left in the pipeline, but monthly patches are going to end in June.

In a blog post, DICE explained that, now that the final DLC map pack is available, the studio will begin winding down frequent updates in the next few months. Before that, however, a couple of big changes are coming. First, the maps from the They Shall Not Pass DLC will be made playable for everyone for free; the map Rupture is already available. More maps will be unlocked for everyone in May.