I built those charts on Google Finance. At the time (10 years ago) there was no better alternative for building interactive charting in browsers. After I left Google Finance I feel that the team has attempted a few times to remove Flash, but I don't know why they didn't succeed. Others on this thread are probably right - finance is not enough of a focus for Google, only so many engineering hours, better spent on othe…
I'm curious as to why, if it's seemed so difficult to replace them, that Google hasn't gone with a rather wide-spread and capable library like High Charts?[0][1]
edit: Or am I missing the core problem. Not that it's difficult for Google to coordinate on an internal chart library, but rather that it's a problem of integrating a new display format?
And while we're on charting, I recommend having a look at: https://cryptowat.ch/ (Though it has a bit of a different purpose)
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