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SegWit2x Developers have announced they're not putting in replay protection because they believe the legacy/core Bitcoin will die after the fork (which is quite a gamble), and they believe their fork to be an "upgrade" of Bitcoin rather than an altcoin.

Bitcoin Gold is definitely much more weird. First of all, there's only one developer actively working on it, and he hasn't even done that much work. Also, there's a huge premine of about 100,000 coins for "coin development." If BTG is valued the same as BTC, this is hundreds of millions of dollars for small fork changes.

Trezor, Bittrex, and many exchanges have stated they will not support BTG without Replay Protection, and they don't have it in yet. See articles like this for more information; BTG hasn't implemented replay protection yet.

Thanks, looks like I misunderstood!

Sure! :)

The hope is that the BTG developer can come to his/her senses and implement replay protection. However, currently it's not implemented, and I always like to prepare for the worst possible scenario.

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