update:
OKX still fails to provide a proper response about the mandatory verification for existing users.

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"We understand that the request for identity verification may have come as a surprise, and we apologize for any inconvenience it may have caused. We want to assure you that this is not a sudden request, as our Terms of Service (ToS) clause 7.1 requires users to provide accurate information when signing up.

As a cryptocurrency exchange, we recognize the challenges of navigating regulations in the industry. Therefore, we have been working to establish a balance between promoting the crypto ecosystem while staying compliant with jurisdictions. In November 2022, we implemented a policy where new users are no longer allowed to access our service without KYC, and now we have made KYC mandatory for all our users."

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7.1 Account Registration and Identity Verification: in order to use any of the Services, you are required to provide accurate information for all fields on the registration page to verify your identity, along with affirming these Terms. By registering an account with OKX, You agree and represent that You will use the Account only for yourself, and not on behalf of any third party, unless approved by OKX. You agree to provide us with authentic information at registration and on an ongoing basis for the purposes of identity verification and the detection of money laundering, terrorist financing, fraud, or any other financial crime, including without limitation a copy of your government issued photo ID and evidence of residency such as a utility bill or bank statement. If any such information changes, it is your obligation to update such information as soon as possible.

This section referring to new registration and is missing any mention to current unverified clients.

They continue with threats to mark my account as suspisious:

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"Please be aware that this is a platform-wide transition and we advise compliance with at least KYC level 1 to access basic features. Continued resistance may raise suspicions and potentially trigger a risk flag, prompting an investigation and a thorough review of your account."