Some sources state that there is a daily withdrawal limit for non-verified users.
Is this true
No it's not true. I can't also find sources stated that it's possible.
According to
this official article from gate.io about identity verification and kyc procedures updated last April, withdrawals are not permitted without proceeding through KYC1 verification:
2. Is Identity Verification (KYC) mandatory for deposit ?
You can deposit while preparing for Identity verification, but please make sure you have finished it before withdrawing.
Falagged withdrawals are subjects for another KYC level called KYC2, and if you have a pending withdrawal submitted before you verify your identity, you have to go through both levels of KYC. Here the proof from the same article:
The processing time of KYC or identity verification may be half an hour to 12 hours.
Please note, if you have any withdrawal in verification status(KYC required), you have to go through both KYC 1 & KYC2.