I've been rummaging through very many threads on here and on steam and have found quite a few people talking about getting banned for downloading custom games but not anyone warning people about getting banned for doing said thing. It is perfectly safe they say! They added steam workshop functionality for a reason!
My brother and 5 friends all come back to halo to try out cursed campaigns and custom games. Not once do we even matchmake. Boom, brother is hit with an indefinite Xbox Live suspension. Not from just halo. His whole entire Xbox account. We have no idea how long it is or really what caused it.
If you have a ton of money and time invested in your Xbox account then STAY AS FAR AWAY AS POSSIBLE from the halo steam workshop and the file share for custom games.
I've seen this happen already in Battlefront 2. People tried to pretend it wasn't happening but now people know some mods were getting your account flagged. The authors didn't mean for it to happen but it was happening none the less. I think the same is happening here.
EDIT: Forgot to say that this all happened on Halo MCC
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