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Buy and sell stock at specific earnings
Enjoy the free trades as long as they last, and take advantage of it since this is no longer functionally a tax on your potential profits.  On a side note, RobinHood and others in the past have roped customers in with low-to-zero fee trades before changing the business paradigm completely or ceasing operations. All brokers could be charging LESS fees than they do, but they get charged fees by the exchanges, and will eventually pass this down to the customer in some way or go bankrupt.