At the end of the day Mariana, if people want to pay for your service and if they understand what it is they buying and all risks associated with it, then I guess, that's between you and them, a civil agreement aka contract. The way I see it you not forcing anyone by gunpoint to buy your concept and I think you don't make unsolicited calls, emails etc, then the client can't complain afterwards. You must not misrepresent/mislead anything to them however, be very , very careful there!
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