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While everything you have said is true, Coinbase's policies are far more wide reaching than that. They essentially give Coinbase the ability to close your account and seize your coins for literally any reason at all, and there is nothing you can do about it. For example:
6.10. Suspension, Termination, and Cancellation. Coinbase may suspend, restrict, or terminate your access to any or all of the Coinbase Services, and/or deactivate or cancel your Coinbase Account(s), with immediate effect for any reason at its sole discretion and is under no obligation to disclose the details of its decision to take such action with you. You acknowledge that Coinbase's decision to take certain actions, including limiting access to, suspending, or closing your account for any reason in our sole discretion, may be based on confidential criteria that are essential to Coinbase's risk management and security protocols. You agree that Coinbase is under no obligation to disclose the details of its risk management and security procedures to you.
At any time, for any reason, and they won't even tell you why, let alone let you appeal against it.
And as we have seen from several recent court cases and bankruptcy proceedings, the instant coins are deposited to a centralized exchange, then legally speaking those coins belong to the exchange and you have absolutely no claim over them. There are thousands of such users who have had various centralized exchanges simply seize their coins with no explanation ever given.