What wallet does MinerGate use?

It is indeed legit .

This way, Lumi Wallet is going to become the main wallet to store and operate EOS within MinerGate’s ecosystem. Lumi Wallet was initially founded in January 2018 by a team of cryptocurrency enthusiasts, just like MinerGate.

MinerGate GUI guide for Windows

If there is an ‘Offline’ red marker in the Withdrawals column of your currency, then withdrawals and transactions are currently disabled for this currency and you will not be able to withdraw until they are enabled again.

You choose ‘Transfer’ when you want to send your funds to another account within MinerGate. You choose ‘Withdraw’ when you want to send your funds to an external wallet. All withdrawals and transfers require the 2-factor authentication option enabled for your account.

Withdrawing through cryptocurrency ATMs