Why? Can't a company make it so that there's a "cancel contract" method? I am not an Ethereum expert, I just don't understand, to be clear. I'm sure this is fa

Why? Can't a company make it so that there's a "cancel contract" method? I am not an Ethereum expert, I just don't understand, to be clear. I'm sure this is far more basic than what you know how to do, but this seems pretty simple to add a "cancel contract" method that seems like it'd meet the requirement to be as easy to cancel as it was to set up. The account status seems like they can at any time just read it off the smart contract, they already do for balance monitoring each month in this example. https://www.sitepen.com/blog/smart-contracts-a-tutorial https://www.sitepen.com/blog/smart-contracts-a-tutorial Is the issue that there will be a bunch of extraneous data on the chain or something when, say, Verizon puts their entire customer database onto Ethereum?