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He misuses the merit system by proposing to give merit to whoever guesses the price of bitcoin on a date instead of giving merit for quality.
I don't think that this is an enough reason for a tag. Being able to guess the price of bitcoin is a good job already, it must not be some walls of text to be quality. Secondly, the user being tagged is a full member and also not a merit source.
Note: I don't know if there are other ill behaviours of that user, I just created this thread to get clarified if there was an obvious merit abuse incase of subsequent scenarios.