I've never had the misfortune to work with somebody like that, or indeed let myself become like that, but I've seen this in open source projects. One got forke

I've never had the misfortune to work with somebody like that, or indeed let myself become like that, but I've seen this in open source projects. One got forked after years of misery, another eventually became obsolete technology-wise. They were genuinely instructive as an example of how not to behave.