Yes, but fundamentally they can now take your Bitcoins and provide a service in return. That's called trade. Anything beyond that basic exchange is nice, but akin to icing on the cake.
Well no, not really. How do you know a user has paid? Sure there might be a 1BTC transaction in the last 5 minutes, but is it the user who has just paid or somebody else who hasn't contacted you yet? Such simple issues are made simple by just using Bitcoin the way it was intended.
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