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Maybe I'm not cynical, but I don't think money was the primary reason he changed his tune. I think it is just good old-fashioned paternalism: the belief that the rest of us are too stupid to make intelligent decisions if provided with accurate information.
The messaging is much simpler if you just tell everyone to get vaccinated, and mandate the vaccines, versus the more complicated argument that you don't need a shot if you've already had covid, or that having covid should count as having had a shot. He and his elk think the rest of us are too stupid to follow that.
I actually think that's worse than plain old greed, because it means they enjoy telling us what to do even if there's nothing in it for them. Just for the sheer pleasure of having that power because they know how we should live our lives better than we do ourselves.