So long as you use the moderation endpoint and make an active effort to ensure your userbase adheres to your companies acceptable use policy, you should be fine with your API key.
OpenAI is not in the business of banning developers who are clearly following the rules and requirements. Make sure you log your moderation endpoint calls and associated prompts and replies, then you can show OpenAI that you have made a good faith effort using best practices in case there is some dispute.
In short, if you use the moderation endpoint and prevent messages that fail this test from being passed to the model, you have done your part of the agreement.