Hello,
I know in the case of my server, we require players to have both Steam & Discord linked to their FiveM, obviously with some community members having bought GTAV through Epic Games, they’re unable to join the server for whatever reason. But, In a sense, It removes just a few of those “shitters” from joining your server who have either removed their identifiers to circumvent bans or whatever they’re attempting to do.
I haven’t seen any real negative impacts of having a server require both a Steam & Discord Identifier, we hardly ever see anyone unable to connect to the server because of having those requirements in place. Overall, It’s not a bad thing to have, doesn’t affect much & gives you an extra piece of protection in a sense.
I hope this helps 
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