I don’t think you understand splitting the community. Everyone who bought the game has access to play these modes.
You can invite everyone with the game to play with you
Let’s say you bought the dlc, but 10% of your friends didn’t. Now either you play the base with those friends or screw them and play dlc with those who bought it. THAT is splitting the community
If a dlc was released and not everyone bought it, then you are having some on play the base and some play the dlc. After 5 dlc you have some that bought say 3 dlc, maybe 1, maybe all 5. This required server’s to be set up with several different dlc configurations to please everyone with different games