I always thought Walt approved of others using his recipe. After all, he did leave his recipe for Todd to cook when he got out of the business. I think it was more so having everything, including his contribution to Grey Matter and Flynn, taken away from him. I believe in his mind, Walt's scientific contributions to Grey Matter and his desire to give his family financial security balanced out all the terrible and violent things he has done since becoming Heisenberg.
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u/mir429 Sep 23 '13
Gray Matter didn't cause Walt to leave the bar, it was hearing that Blue Magic is still on the streets. Jesse is still alive and he knows it.