@Band228 As a quick workaround you could use a free VPN like Proton.
So I'm starting to think, if you read it like that, they jump through the lobbies, collect the IPs (logs / Wireshark) of the players and then DDoS them. And so you have a 12 player match destroyed quite quickly.
Players don't change their IPs that often, 24-hour forced disconnection hardly exists anymore, so the IP remains the same for most private connections until the router is restarted.
That's not so far-fetched. There was a time when they went through the lobbies and crashed them with a ?bug? (I don't know if they were the same ones).
@Brutus5000 Couldn't you force all connections to be established via relay (global) and prevent all P2P connections so that the private IPs don't appear anywhere (as with a VPN)? Might be worth a try.