But this is not simple image. This is interactive chart. You can hover lines and get some info via tool tip.
Apparently you are using quite old browser, if you don't mind asking you? Since D3js, the lib used to generate SVG, supports majority of browsers[1].
It does date from the present decade, however. It's not that old. I'm somewhat amused by the number of sites which fail to work properly (some at all) with it.
Imgur is entirely dead. Reddit I can read, but moderation and reply buttons don't work. I hit the beta rollout of a news site last night (apparently part of their A/B test) and found that among the features which failed to work was the "opt out of beta" button.
So... Update, maybe? I'm sure the web developers of those sites aren't "somewhat amused" by having to try to support your ancient browser.
D3 should work in any browser that supports SVG, which is every desktop browser but IE8 [1]. If you're still using IE8, some sites not working is going to be the least of your problems soon - Microsoft isn't patching it anymore.
Nor am I obligated to use systems and services which don't support minimal HTML interfaces. Graceful degradation is generally useful, particularly as most web spidering is still basic HTML (some now support aspects of JS as I understand). You're invisible to the world if you can't get indexed.
I've also found that the very rudimentary browsers included in cheap feature phones tend not to work particularly well with any measure of "modern" websites (though others do support these fairly well). While I don't suppose these are a large financial market, they're likely a large user market, as those phones are both cheap and exceptionally thrifty with battery life (weeks, not hours).
Given that this is graphical content, that's less a concern. But as I noted above: simply providing a fallback JPEG alt would have worked.
And noting an issue isn't the same as complaining. Actually, if you'll note, I fixed the problem, after a fashion, by providing a link to alternate and accessible content.
But thanks for your depth of understanding, empathy, and sympathy.
[1] https://github.com/mbostock/d3/wiki#browser--platform-suppor...