The bigger issue is, if you're refusing to honour a contract as a vendor, not only do you risk a lawsuit like this one. But more importantly, who is ever going to sign up for another contract with you? You just proved it isn't worth the paper it's written on.
Unwritten terms like "valid until I decide to tear it up haha lol" are not generally appreciated by companies that depend on your stuff for their business. Of course you can extort your existing customers until they manage to move away but basically in the longer term you're suiciding your entire business.
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