Gate.io start requiring KYC for Deposit on Feb/2021 ---> https://bitcointalksearch.org/topic/--5315063
Are they scammers? There are not enough claims to confirm this.
Will they ask for KYC verification? Yes, at some point, KYC verification will be requested, so even if you use the site for several times and KYC not requested, it will be requested sooner or later.
what should I do? Try to avoid them if you don't want to complete KYC.
What if the currency I want to buy/sell is only listed only on gate.io? Avoid it.