Can I be a professional market data user and have IBKR Lite?

Yes. The designation as a Professional or Non-Professional for market data purposes is based upon exchange definitions and has no bearing on the IBKR Lite pricing plan. An individual classified as a Professional for market data purposes is not precluded from maintaining an IBKR Lite account. Similarly, an individual classified as a Non-Professional for market data purposes is not precluded from maintaining an IBKR Pro account.

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Why was my market data subscriber status changed to Professional?
If I change my market data subscriber status mid-month, will I be charged for new subscriptions?
Are Professional accounts subject to different commission rates?