I have deep distrust to put $25K with any brokerage firm. What if the brokerage is not stable? What if someone tempers my account? What if someone intercepts communication between my computer and the firms? What if my account is compromised? I will lose all without any protection.
What should I do?

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The fact is that you have no $25K.
What should I do?

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The fact is that you have no $25K.