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as much as iOS is a device identification nightmare, Android is a device identification paradise.

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Everybody makes occasional mistakes, cheaters/abusers included."your DB"

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NEVER EVER use IPv4 for long-term bans

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If using MAC addresses to identify devices, you SHOULD gather stats on repeating MAC addresses within your DB

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Unless our Joe Average is a security specialist, he’ll install the certificate for sure

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On the other hand, it is Very Clear that such a system IS a wet dream of a pretty much ANY government out there.

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I STRONGLY recommend to provide an option for your players to use 3rd-party “social logins

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you can be sure that as soon as your game is alive and kicking - you'll need to implement password recovery for your players.