It's surreal that I've been working as a software developer for more than a year and that I've been working towards this goal for three. In that ti...
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Rust is not obviously specifically for blockchain development it's just used more in those areas, because it's easier to enforce good coding practises and patterns than C++. It also has a shorter learning curve, so you can just pick up people that are interested in it and train them. C++ developers although not rare, would probably not work in a crypto start up, as the good ones are mostly well seasoned developers.
As far as C++ is concerned the link you provided is not the official website, the official one (if there is one) would be isocpp.org/