I use electrum. When and how can we claim our bitcoin gold?
Which version of Electrum do you use? If you use a standard wallet from version 2.9 or earlier (so your addresses appear as 1xxxxx), then you can use the Coinomi wallet to extract your BTG.
First and foremost, move your coins to new addresses under your control and wait for confirmation. You don't want to risk sweeping keys that still have BTC in them. Once that is done, you can open Coinomi and sweep the original private keys (which now have 0 BTC) into the BTG wallet.
Very possible it's a pump and dump
It's certainly a cash grab. I do think the developers are incentivized to create value for the BTG network since they pre-mined a lot of coins. Unfortunately, they seem to be pretty incompetent.....