In most jurisdictions, that would be in violation of laws. The laws are created to prevent shady operators, like people who go around 'fixing' the roof for old

In most jurisdictions, that would be in violation of laws. The laws are created to prevent shady operators, like people who go around 'fixing' the roof for old people. They agree to the work, then get charged a fortune for overages, which usually just amount to painting the gutters. Another example is the phone scammers offering 'virus fixes'. These are generally in violation of different laws.